78800521 divided by 60 
The aim is to understand the frequency of 60 in 78800521.

Step 1:
7 divided by 60 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 60

Step 2:
If we divide 78 by 60, we get 1 and a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 60 away from 78, we end up with 18.
Bring next digit (8) of the dividend behind the 18 and repeat the process: 188 / 60

Going ahead to step 3:
60 can be fit into 188 3 times, resulting in a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 13.0
If we subtract 180 from 188, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 60

Step 4:
The number 60 fits into 80 1 times, leaving a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 131.0
Deduct 60 from 80 and we're left with 20.
Append the next digit (0) from the dividend to 20 and continue with: 200 / 60

Let's proceed to step 5:
60 can be fit into 200 3 times, resulting in a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 1313.0
The remainder is 20 after subtracting 180 from 200.
Append the next digit (5) from the dividend to 20 and continue with: 205 / 60

Advancing to step 6:
60 can be fit into 205 3 times, resulting in a remainder of 25.
The number 3 becomes the next digit in our result. 
Result so far: 13133.0
The remainder is 25 after subtracting 180 from 205.
Fetch the next digit (2) from the dividend, attach it to 25 and continue: 252 / 60

Moving on to step 7:
The number 60 fits into 252 4 times, leaving a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 131334.0
Subtract 240 from 252 to get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 60

Let's proceed to step 8:
If we divide 121 by 60, we get 2 and a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 1313342.0
If we take 120 away from 121, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
10 divided by 60 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 1313342.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
The number 60 fits into 100 1 times, leaving a remainder of 40.
Record the quotient 1 as the next digit in the result. 
Result so far: 1313342.01
The remainder is 40 after subtracting 60 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 11:
60 goes into 400 6 times with a remainder of 40.
Record the quotient 6 as the next digit in the result. 
Result so far: 1313342.016
If we take 360 away from 400, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
When dividing 400 by 60, we get 6 with a remainder of 40.
The number 6 becomes the next digit in our result. 
Result so far: 1313342.0166
If we subtract 360 from 400, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 1313342.0166, with a leftover of 0.0004.