We look at the division of 65087519 by 864 
The aim is to understand the frequency of 864 in 65087519.

Let's proceed to step 1:
When dividing 6 by 864, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 864

Let's proceed to step 2:
If we divide 65 by 864, we get 0 and a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 65 after subtracting 0 from 65.
Take the next digit (0) from the dividend and append it to 65, then repeat: 650 / 864

On to step 3:
650 divided by 864 is 0 with a remainder of 650.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 650, we end up with 650.
Bring next digit (8) of the dividend behind the 650 and repeat the process: 6508 / 864

On to step 4:
864 can be fit into 6508 7 times, resulting in a remainder of 460.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 6048 from 6508, we get 460.
Append the next digit (7) from the dividend to 460 and continue with: 4607 / 864

Going ahead to step 5:
When dividing 4607 by 864, we get 5 with a remainder of 287.
Use 5 as the next digit of our solution. 
Result so far: 75.0
Deduct 4320 from 4607 and we're left with 287.
Append the next digit (5) from the dividend to 287 and continue with: 2875 / 864

Moving on to step 6:
If we divide 2875 by 864, we get 3 and a remainder of 283.
The number 3 becomes the next digit in our result. 
Result so far: 753.0
Subtracting 2592 from 2875 leaves us with 283.
Include the next digit (1) from the dividend after 283, then repeat: 2831 / 864

Going ahead to step 7:
When dividing 2831 by 864, we get 3 with a remainder of 239.
Put 3 as the next digit of the answer. 
Result so far: 7533.0
The remainder is 239 after subtracting 2592 from 2831.
Bring next digit (9) of the dividend behind the 239 and repeat the process: 2399 / 864

Advancing to step 8:
864 goes into 2399 2 times with a remainder of 671.
Use 2 as the next digit of our solution. 
Result so far: 75332.0
Subtracting 1728 from 2399 leaves us with 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6710, and continue the process.

Step 9:
The number 864 fits into 6710 7 times, leaving a remainder of 662.
Write down 7 as next digit of the result. 
Result so far: 75332.7
If we take 6048 away from 6710, we end up with 662.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Moving on to step 10:
If we divide 6620 by 864, we get 7 and a remainder of 572.
The number 7 becomes the next digit in our result. 
Result so far: 75332.77
The remainder is 572 after subtracting 6048 from 6620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

After the division, we end up with 75332.77 and a remainder of 0.572.