65278786 ÷ 639 
The aim is to understand the frequency of 639 in 65278786.

Moving on to step 1:
If we divide 6 by 639, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (5) from the dividend, attach it to 6 and continue: 65 / 639

Let's proceed to step 2:
When dividing 65 by 639, we get 0 with a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 65 leaves us with 65.
Fetch the next digit (2) from the dividend, attach it to 65 and continue: 652 / 639

Moving on to step 3:
The number 639 fits into 652 1 times, leaving a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 639 away from 652, we end up with 13.
Grab the next digit (7) from the dividend, add it to 13, then carry on: 137 / 639

On to step 4:
639 can be fit into 137 0 times, resulting in a remainder of 137.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 137, we end up with 137.
Bring next digit (8) of the dividend behind the 137 and repeat the process: 1378 / 639

Advancing to step 5:
639 can be fit into 1378 2 times, resulting in a remainder of 100.
The number 2 becomes the next digit in our result. 
Result so far: 102.0
If we take 1278 away from 1378, we end up with 100.
Append the next digit (7) from the dividend to 100 and continue with: 1007 / 639

On to step 6:
The number 639 fits into 1007 1 times, leaving a remainder of 368.
Record the quotient 1 as the next digit in the result. 
Result so far: 1021.0
If we take 639 away from 1007, we end up with 368.
Include the next digit (8) from the dividend after 368, then repeat: 3688 / 639

Let's proceed to step 7:
When dividing 3688 by 639, we get 5 with a remainder of 493.
Record the quotient 5 as the next digit in the result. 
Result so far: 10215.0
Subtracting 3195 from 3688 leaves us with 493.
Append the next digit (6) from the dividend to 493 and continue with: 4936 / 639

Advancing to step 8:
When dividing 4936 by 639, we get 7 with a remainder of 463.
Put 7 as the next digit of the answer. 
Result so far: 102157.0
The remainder is 463 after subtracting 4473 from 4936.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4630, and continue the process.

Going ahead to step 9:
When dividing 4630 by 639, we get 7 with a remainder of 157.
The next digit of our result is 7. 
Result so far: 102157.7
Subtracting 4473 from 4630 leaves us with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Step 10:
The number 639 fits into 1570 2 times, leaving a remainder of 292.
Use 2 as the next digit of our solution. 
Result so far: 102157.72
If we subtract 1278 from 1570, we get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Advancing to step 11:
639 can be fit into 2920 4 times, resulting in a remainder of 364.
The next digit of our result is 4. 
Result so far: 102157.724
Deduct 2556 from 2920 and we're left with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Going ahead to step 12:
3640 divided by 639 is 5 with a remainder of 445.
Put 5 as the next digit of the answer. 
Result so far: 102157.7245
If we subtract 3195 from 3640, we get 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

Going ahead to step 13:
639 goes into 4450 6 times with a remainder of 616.
Use 6 as the next digit of our solution. 
Result so far: 102157.72456
If we take 3834 away from 4450, we end up with 616.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

Advancing to step 14:
639 can be fit into 6160 9 times, resulting in a remainder of 409.
Record the quotient 9 as the next digit in the result. 
Result so far: 102157.724569
The remainder is 409 after subtracting 5751 from 6160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4090, and continue the process.

On to step 15:
When dividing 4090 by 639, we get 6 with a remainder of 256.
Use 6 as the next digit of our solution. 
Result so far: 102157.7245696
The remainder is 256 after subtracting 3834 from 4090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Step 16:
639 can be fit into 2560 4 times, resulting in a remainder of 4.
Write down 4 as next digit of the result. 
Result so far: 102157.72456964
Subtract 2556 from 2560 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 102157.72456964 and a remainder of 4e-09.