We look at the division of 64853172 by 863 
The aim is to understand the frequency of 863 in 64853172.

Going ahead to step 1:
If we divide 6 by 863, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 863

Going ahead to step 2:
863 can be fit into 64 0 times, resulting in a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Bring next digit (8) of the dividend behind the 64 and repeat the process: 648 / 863

Moving on to step 3:
648 divided by 863 is 0 with a remainder of 648.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 648, we end up with 648.
Append the next digit (5) from the dividend to 648 and continue with: 6485 / 863

Step 4:
863 can be fit into 6485 7 times, resulting in a remainder of 444.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Deduct 6041 from 6485 and we're left with 444.
Fetch the next digit (3) from the dividend, attach it to 444 and continue: 4443 / 863

Advancing to step 5:
When dividing 4443 by 863, we get 5 with a remainder of 128.
Record the quotient 5 as the next digit in the result. 
Result so far: 75.0
If we subtract 4315 from 4443, we get 128.
Grab the next digit (1) from the dividend, add it to 128, then carry on: 1281 / 863

Going ahead to step 6:
863 goes into 1281 1 times with a remainder of 418.
Record the quotient 1 as the next digit in the result. 
Result so far: 751.0
If we take 863 away from 1281, we end up with 418.
Append the next digit (7) from the dividend to 418 and continue with: 4187 / 863

Advancing to step 7:
When dividing 4187 by 863, we get 4 with a remainder of 735.
The next digit of our result is 4. 
Result so far: 7514.0
Subtract 3452 from 4187 to get 735.
Append the next digit (2) from the dividend to 735 and continue with: 7352 / 863

On to step 8:
The number 863 fits into 7352 8 times, leaving a remainder of 448.
Write down 8 as next digit of the result. 
Result so far: 75148.0
Subtracting 6904 from 7352 leaves us with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Step 9:
If we divide 4480 by 863, we get 5 and a remainder of 165.
The next digit of our result is 5. 
Result so far: 75148.5
Subtracting 4315 from 4480 leaves us with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Moving on to step 10:
The number 863 fits into 1650 1 times, leaving a remainder of 787.
Put 1 as the next digit of the answer. 
Result so far: 75148.51
Subtracting 863 from 1650 leaves us with 787.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7870, and continue the process.

Let's proceed to step 11:
863 can be fit into 7870 9 times, resulting in a remainder of 103.
The next digit of our result is 9. 
Result so far: 75148.519
Deduct 7767 from 7870 and we're left with 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Advancing to step 12:
1030 divided by 863 is 1 with a remainder of 167.
Put 1 as the next digit of the answer. 
Result so far: 75148.5191
If we subtract 863 from 1030, we get 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

Step 13:
1670 divided by 863 is 1 with a remainder of 807.
The number 1 becomes the next digit in our result. 
Result so far: 75148.51911
If we subtract 863 from 1670, we get 807.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8070, and continue the process.

After the division, we end up with 75148.51911 and a remainder of 0.000807.