We look at the division of 15939297 by 687 
The aim is to understand the frequency of 687 in 15939297.

Moving on to step 1:
1 divided by 687 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 687

On to step 2:
When dividing 15 by 687, we get 0 with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 687

Step 3:
687 can be fit into 159 0 times, resulting in a remainder of 159.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 159 leaves us with 159.
Include the next digit (3) from the dividend after 159, then repeat: 1593 / 687

Moving on to step 4:
The number 687 fits into 1593 2 times, leaving a remainder of 219.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 1374 from 1593 leaves us with 219.
Include the next digit (9) from the dividend after 219, then repeat: 2199 / 687

On to step 5:
The number 687 fits into 2199 3 times, leaving a remainder of 138.
Write down 3 as next digit of the result. 
Result so far: 23.0
If we subtract 2061 from 2199, we get 138.
Bring next digit (2) of the dividend behind the 138 and repeat the process: 1382 / 687

On to step 6:
When dividing 1382 by 687, we get 2 with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 232.0
If we subtract 1374 from 1382, we get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 687

Step 7:
89 divided by 687 is 0 with a remainder of 89.
Write down 0 as next digit of the result. 
Result so far: 2320.0
If we subtract 0 from 89, we get 89.
Include the next digit (7) from the dividend after 89, then repeat: 897 / 687

Moving on to step 8:
687 can be fit into 897 1 times, resulting in a remainder of 210.
Write down 1 as next digit of the result. 
Result so far: 23201.0
Subtracting 687 from 897 leaves us with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 9:
687 goes into 2100 3 times with a remainder of 39.
Record the quotient 3 as the next digit in the result. 
Result so far: 23201.3
Subtract 2061 from 2100 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 10:
The number 687 fits into 390 0 times, leaving a remainder of 390.
The next digit of our result is 0. 
Result so far: 23201.3
If we take 0 away from 390, we end up with 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Let's proceed to step 11:
The number 687 fits into 3900 5 times, leaving a remainder of 465.
The next digit of our result is 5. 
Result so far: 23201.305
If we subtract 3435 from 3900, we get 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Moving on to step 12:
4650 divided by 687 is 6 with a remainder of 528.
Record the quotient 6 as the next digit in the result. 
Result so far: 23201.3056
If we take 4122 away from 4650, we end up with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

On to step 13:
687 goes into 5280 7 times with a remainder of 471.
The next digit of our result is 7. 
Result so far: 23201.30567
If we take 4809 away from 5280, we end up with 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

Advancing to step 14:
687 goes into 4710 6 times with a remainder of 588.
Write down 6 as next digit of the result. 
Result so far: 23201.305676
If we take 4122 away from 4710, we end up with 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

Advancing to step 15:
When dividing 5880 by 687, we get 8 with a remainder of 384.
Put 8 as the next digit of the answer. 
Result so far: 23201.3056768
The remainder is 384 after subtracting 5496 from 5880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Going ahead to step 16:
687 goes into 3840 5 times with a remainder of 405.
Put 5 as the next digit of the answer. 
Result so far: 23201.30567685
If we subtract 3435 from 3840, we get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

In conclusion, the division gives 23201.30567685 with a balance of 4.05e-07.