We look at the division of 871864 by 72 
The aim is to understand the frequency of 72 in 871864.

Let's proceed to step 1:
When dividing 8 by 72, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 72

Advancing to step 2:
87 divided by 72 is 1 with a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 72 from 87 to get 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 72

Step 3:
If we divide 151 by 72, we get 2 and a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
The remainder is 7 after subtracting 144 from 151.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 72

Going ahead to step 4:
The number 72 fits into 78 1 times, leaving a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 121.0
If we take 72 away from 78, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 72

Advancing to step 5:
If we divide 66 by 72, we get 0 and a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 1210.0
Subtracting 0 from 66 leaves us with 66.
Take the next digit (4) from the dividend and append it to 66, then repeat: 664 / 72

On to step 6:
664 divided by 72 is 9 with a remainder of 16.
The number 9 becomes the next digit in our result. 
Result so far: 12109.0
Subtracting 648 from 664 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 7:
72 goes into 160 2 times with a remainder of 16.
The next digit of our result is 2. 
Result so far: 12109.2
Subtracting 144 from 160 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 8:
The number 72 fits into 160 2 times, leaving a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 12109.22
Subtract 144 from 160 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 12109.22 with a remaining 0.016.