We look at the division of 64577720 by 13 
The aim is to understand the frequency of 13 in 64577720.

Let's proceed to step 1:
13 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 13

Let's proceed to step 2:
The number 13 fits into 64 4 times, leaving a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 52 from 64 leaves us with 12.
Bring next digit (5) of the dividend behind the 12 and repeat the process: 125 / 13

Advancing to step 3:
13 goes into 125 9 times with a remainder of 8.
Put 9 as the next digit of the answer. 
Result so far: 49.0
Subtracting 117 from 125 leaves us with 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 13

Step 4:
13 goes into 87 6 times with a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 496.0
The remainder is 9 after subtracting 78 from 87.
Append the next digit (7) from the dividend to 9 and continue with: 97 / 13

On to step 5:
If we divide 97 by 13, we get 7 and a remainder of 6.
Put 7 as the next digit of the answer. 
Result so far: 4967.0
Subtract 91 from 97 to get 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 13

Going ahead to step 6:
When dividing 67 by 13, we get 5 with a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 49675.0
If we subtract 65 from 67, we get 2.
Include the next digit (2) from the dividend after 2, then repeat: 22 / 13

Moving on to step 7:
The number 13 fits into 22 1 times, leaving a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 496751.0
If we subtract 13 from 22, we get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 13

Advancing to step 8:
If we divide 90 by 13, we get 6 and a remainder of 12.
The next digit of our result is 6. 
Result so far: 4967516.0
Subtract 78 from 90 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 9:
13 goes into 120 9 times with a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 4967516.9
The remainder is 3 after subtracting 117 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 10:
30 divided by 13 is 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 4967516.92
If we subtract 26 from 30, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
When dividing 40 by 13, we get 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 4967516.923
Subtract 39 from 40 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 12:
13 can be fit into 10 0 times, resulting in a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 4967516.923
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.

Advancing to step 13:
13 goes into 100 7 times with a remainder of 9.
Put 7 as the next digit of the answer. 
Result so far: 4967516.92307
Deduct 91 from 100 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 14:
If we divide 90 by 13, we get 6 and a remainder of 12.
The next digit of our result is 6. 
Result so far: 4967516.923076
If we subtract 78 from 90, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 15:
13 goes into 120 9 times with a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 4967516.9230769
If we subtract 117 from 120, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 16:
13 can be fit into 30 2 times, resulting in a remainder of 4.
The next digit of our result is 2. 
Result so far: 4967516.92307692
Deduct 26 from 30 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

After the division, we end up with 4967516.92307692 and a remainder of 4e-09.