We divide 87336639 by 15
The aim is to understand the frequency of 15 in 87336639.

Going ahead to step 1:
15 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 15

Advancing to step 2:
When dividing 87 by 15, we get 5 with a remainder of 12.
The next digit of our result is 5. 
Result so far: 5.0
If we subtract 75 from 87, we get 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 15

On to step 3:
The number 15 fits into 123 8 times, leaving a remainder of 3.
Use 8 as the next digit of our solution. 
Result so far: 58.0
If we take 120 away from 123, we end up with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 15

Moving on to step 4:
15 goes into 33 2 times with a remainder of 3.
The next digit of our result is 2. 
Result so far: 582.0
The remainder is 3 after subtracting 30 from 33.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 15

Moving on to step 5:
The number 15 fits into 36 2 times, leaving a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 5822.0
Subtracting 30 from 36 leaves us with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 15

Step 6:
66 divided by 15 is 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 58224.0
The remainder is 6 after subtracting 60 from 66.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 15

Moving on to step 7:
15 goes into 63 4 times with a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 582244.0
If we take 60 away from 63, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 15

Moving on to step 8:
The number 15 fits into 39 2 times, leaving a remainder of 9.
The next digit of our result is 2. 
Result so far: 5822442.0
If we take 30 away from 39, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 9:
90 divided by 15 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 5822442.6
If we subtract 90 from 90, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 5822442.6
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5822442.6
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 5822442.6, with a leftover of 0.0.