86370037 divided by 639 
The aim is to understand the frequency of 639 in 86370037.

Going ahead to step 1:
If we divide 8 by 639, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 639

Let's proceed to step 2:
639 can be fit into 86 0 times, resulting in a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Append the next digit (3) from the dividend to 86 and continue with: 863 / 639

Going ahead to step 3:
639 can be fit into 863 1 times, resulting in a remainder of 224.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 224 after subtracting 639 from 863.
Fetch the next digit (7) from the dividend, attach it to 224 and continue: 2247 / 639

On to step 4:
The number 639 fits into 2247 3 times, leaving a remainder of 330.
Write down 3 as next digit of the result. 
Result so far: 13.0
Subtract 1917 from 2247 to get 330.
Take the next digit (0) from the dividend and append it to 330, then repeat: 3300 / 639

Let's proceed to step 5:
When dividing 3300 by 639, we get 5 with a remainder of 105.
The number 5 becomes the next digit in our result. 
Result so far: 135.0
Deduct 3195 from 3300 and we're left with 105.
Include the next digit (0) from the dividend after 105, then repeat: 1050 / 639

Let's proceed to step 6:
When dividing 1050 by 639, we get 1 with a remainder of 411.
Record the quotient 1 as the next digit in the result. 
Result so far: 1351.0
Subtract 639 from 1050 to get 411.
Take the next digit (3) from the dividend and append it to 411, then repeat: 4113 / 639

Let's proceed to step 7:
The number 639 fits into 4113 6 times, leaving a remainder of 279.
Write down 6 as next digit of the result. 
Result so far: 13516.0
Subtracting 3834 from 4113 leaves us with 279.
Fetch the next digit (7) from the dividend, attach it to 279 and continue: 2797 / 639

On to step 8:
639 goes into 2797 4 times with a remainder of 241.
Write down 4 as next digit of the result. 
Result so far: 135164.0
Subtracting 2556 from 2797 leaves us with 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Advancing to step 9:
2410 divided by 639 is 3 with a remainder of 493.
The next digit of our result is 3. 
Result so far: 135164.3
If we subtract 1917 from 2410, we get 493.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4930, and continue the process.

On to step 10:
If we divide 4930 by 639, we get 7 and a remainder of 457.
Put 7 as the next digit of the answer. 
Result so far: 135164.37
The remainder is 457 after subtracting 4473 from 4930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4570, and continue the process.

On to step 11:
4570 divided by 639 is 7 with a remainder of 97.
Use 7 as the next digit of our solution. 
Result so far: 135164.377
Deduct 4473 from 4570 and we're left with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

The final outcome is 135164.377, with a leftover of 0.0097.