63959648 divided by 509 
The aim is to understand the frequency of 509 in 63959648.

Advancing to step 1:
When dividing 6 by 509, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 509

Let's proceed to step 2:
If we divide 63 by 509, we get 0 and a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Bring next digit (9) of the dividend behind the 63 and repeat the process: 639 / 509

Going ahead to step 3:
When dividing 639 by 509, we get 1 with a remainder of 130.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 509 from 639 and we're left with 130.
Append the next digit (5) from the dividend to 130 and continue with: 1305 / 509

Moving on to step 4:
509 goes into 1305 2 times with a remainder of 287.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 287 after subtracting 1018 from 1305.
Include the next digit (9) from the dividend after 287, then repeat: 2879 / 509

Advancing to step 5:
509 goes into 2879 5 times with a remainder of 334.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
If we subtract 2545 from 2879, we get 334.
Append the next digit (6) from the dividend to 334 and continue with: 3346 / 509

Step 6:
The number 509 fits into 3346 6 times, leaving a remainder of 292.
Put 6 as the next digit of the answer. 
Result so far: 1256.0
Subtracting 3054 from 3346 leaves us with 292.
Bring next digit (4) of the dividend behind the 292 and repeat the process: 2924 / 509

Moving on to step 7:
If we divide 2924 by 509, we get 5 and a remainder of 379.
Record the quotient 5 as the next digit in the result. 
Result so far: 12565.0
Deduct 2545 from 2924 and we're left with 379.
Append the next digit (8) from the dividend to 379 and continue with: 3798 / 509

On to step 8:
If we divide 3798 by 509, we get 7 and a remainder of 235.
Write down 7 as next digit of the result. 
Result so far: 125657.0
If we take 3563 away from 3798, we end up with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Going ahead to step 9:
The number 509 fits into 2350 4 times, leaving a remainder of 314.
Put 4 as the next digit of the answer. 
Result so far: 125657.4
Deduct 2036 from 2350 and we're left with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Going ahead to step 10:
The number 509 fits into 3140 6 times, leaving a remainder of 86.
The next digit of our result is 6. 
Result so far: 125657.46
Subtract 3054 from 3140 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

On to step 11:
When dividing 860 by 509, we get 1 with a remainder of 351.
The next digit of our result is 1. 
Result so far: 125657.461
If we take 509 away from 860, we end up with 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Let's proceed to step 12:
If we divide 3510 by 509, we get 6 and a remainder of 456.
Record the quotient 6 as the next digit in the result. 
Result so far: 125657.4616
Subtract 3054 from 3510 to get 456.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4560, and continue the process.

Step 13:
4560 divided by 509 is 8 with a remainder of 488.
The next digit of our result is 8. 
Result so far: 125657.46168
The remainder is 488 after subtracting 4072 from 4560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

Going ahead to step 14:
509 goes into 4880 9 times with a remainder of 299.
Record the quotient 9 as the next digit in the result. 
Result so far: 125657.461689
Deduct 4581 from 4880 and we're left with 299.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2990, and continue the process.

Advancing to step 15:
509 can be fit into 2990 5 times, resulting in a remainder of 445.
The number 5 becomes the next digit in our result. 
Result so far: 125657.4616895
If we subtract 2545 from 2990, 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.

On to step 16:
The number 509 fits into 4450 8 times, leaving a remainder of 378.
Use 8 as the next digit of our solution. 
Result so far: 125657.46168958
If we subtract 4072 from 4450, we get 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

After the division, we end up with 125657.46168958 and a remainder of 3.78e-07.