We look at the division of 15686859 by 539 
The aim is to understand the frequency of 539 in 15686859.

On to step 1:
539 can be fit into 1 0 times, resulting in 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.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 539

Step 2:
The number 539 fits into 15 0 times, leaving a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Take the next digit (6) from the dividend and append it to 15, then repeat: 156 / 539

Advancing to step 3:
When dividing 156 by 539, we get 0 with a remainder of 156.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 156 after subtracting 0 from 156.
Grab the next digit (8) from the dividend, add it to 156, then carry on: 1568 / 539

Advancing to step 4:
When dividing 1568 by 539, we get 2 with a remainder of 490.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 1078 from 1568 to get 490.
Grab the next digit (6) from the dividend, add it to 490, then carry on: 4906 / 539

Advancing to step 5:
When dividing 4906 by 539, we get 9 with a remainder of 55.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Deduct 4851 from 4906 and we're left with 55.
Grab the next digit (8) from the dividend, add it to 55, then carry on: 558 / 539

Moving on to step 6:
If we divide 558 by 539, we get 1 and a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 291.0
Subtracting 539 from 558 leaves us with 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 539

Advancing to step 7:
195 divided by 539 is 0 with a remainder of 195.
Record the quotient 0 as the next digit in the result. 
Result so far: 2910.0
The remainder is 195 after subtracting 0 from 195.
Include the next digit (9) from the dividend after 195, then repeat: 1959 / 539

Step 8:
539 goes into 1959 3 times with a remainder of 342.
The number 3 becomes the next digit in our result. 
Result so far: 29103.0
Subtracting 1617 from 1959 leaves us with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Step 9:
When dividing 3420 by 539, we get 6 with a remainder of 186.
The number 6 becomes the next digit in our result. 
Result so far: 29103.6
Subtracting 3234 from 3420 leaves us with 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Advancing to step 10:
The number 539 fits into 1860 3 times, leaving a remainder of 243.
The next digit of our result is 3. 
Result so far: 29103.63
Subtract 1617 from 1860 to get 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Going ahead to step 11:
If we divide 2430 by 539, we get 4 and a remainder of 274.
Write down 4 as next digit of the result. 
Result so far: 29103.634
If we take 2156 away from 2430, we end up with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Going ahead to step 12:
When dividing 2740 by 539, we get 5 with a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 29103.6345
Subtracting 2695 from 2740 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 13:
The number 539 fits into 450 0 times, leaving a remainder of 450.
Record the quotient 0 as the next digit in the result. 
Result so far: 29103.6345
If we subtract 0 from 450, we get 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Advancing to step 14:
539 goes into 4500 8 times with a remainder of 188.
Put 8 as the next digit of the answer. 
Result so far: 29103.634508
Subtracting 4312 from 4500 leaves us with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Advancing to step 15:
539 can be fit into 1880 3 times, resulting in a remainder of 263.
Record the quotient 3 as the next digit in the result. 
Result so far: 29103.6345083
The remainder is 263 after subtracting 1617 from 1880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Let's proceed to step 16:
2630 divided by 539 is 4 with a remainder of 474.
The next digit of our result is 4. 
Result so far: 29103.63450834
If we subtract 2156 from 2630, we get 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

After the division, we end up with 29103.63450834 and a remainder of 4.74e-07.