We look at the division of 50907645 by 864 
The aim is to understand the frequency of 864 in 50907645.

On to step 1:
When dividing 5 by 864, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 864

Moving on to step 2:
50 divided by 864 is 0 with a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 50, we end up with 50.
Fetch the next digit (9) from the dividend, attach it to 50 and continue: 509 / 864

Advancing to step 3:
864 can be fit into 509 0 times, resulting in a remainder of 509.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 509 after subtracting 0 from 509.
Bring next digit (0) of the dividend behind the 509 and repeat the process: 5090 / 864

Advancing to step 4:
864 goes into 5090 5 times with a remainder of 770.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 4320 from 5090 leaves us with 770.
Bring next digit (7) of the dividend behind the 770 and repeat the process: 7707 / 864

Going ahead to step 5:
When dividing 7707 by 864, we get 8 with a remainder of 795.
Record the quotient 8 as the next digit in the result. 
Result so far: 58.0
If we take 6912 away from 7707, we end up with 795.
Grab the next digit (6) from the dividend, add it to 795, then carry on: 7956 / 864

Let's proceed to step 6:
864 can be fit into 7956 9 times, resulting in a remainder of 180.
Use 9 as the next digit of our solution. 
Result so far: 589.0
If we take 7776 away from 7956, we end up with 180.
Append the next digit (4) from the dividend to 180 and continue with: 1804 / 864

Let's proceed to step 7:
If we divide 1804 by 864, we get 2 and a remainder of 76.
Write down 2 as next digit of the result. 
Result so far: 5892.0
The remainder is 76 after subtracting 1728 from 1804.
Take the next digit (5) from the dividend and append it to 76, then repeat: 765 / 864

Advancing to step 8:
864 goes into 765 0 times with a remainder of 765.
Use 0 as the next digit of our solution. 
Result so far: 58920.0
Subtract 0 from 765 to get 765.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7650, and continue the process.

Let's proceed to step 9:
864 can be fit into 7650 8 times, resulting in a remainder of 738.
Write down 8 as next digit of the result. 
Result so far: 58920.8
Subtracting 6912 from 7650 leaves us with 738.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

Advancing to step 10:
If we divide 7380 by 864, we get 8 and a remainder of 468.
The number 8 becomes the next digit in our result. 
Result so far: 58920.88
Subtract 6912 from 7380 to get 468.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4680, and continue the process.

The final result is 58920.88 with a remainder of 0.468.