Let's divide 73977139 by 620
The aim is to understand the frequency of 620 in 73977139.

On to step 1:
If we divide 7 by 620, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 620

Moving on to step 2:
620 can be fit into 73 0 times, resulting in a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 73 after subtracting 0 from 73.
Bring next digit (9) of the dividend behind the 73 and repeat the process: 739 / 620

Moving on to step 3:
620 goes into 739 1 times with a remainder of 119.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 620 from 739 leaves us with 119.
Take the next digit (7) from the dividend and append it to 119, then repeat: 1197 / 620

On to step 4:
When dividing 1197 by 620, we get 1 with a remainder of 577.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtract 620 from 1197 to get 577.
Fetch the next digit (7) from the dividend, attach it to 577 and continue: 5777 / 620

Moving on to step 5:
620 goes into 5777 9 times with a remainder of 197.
Use 9 as the next digit of our solution. 
Result so far: 119.0
Subtracting 5580 from 5777 leaves us with 197.
Bring next digit (1) of the dividend behind the 197 and repeat the process: 1971 / 620

Moving on to step 6:
620 goes into 1971 3 times with a remainder of 111.
Write down 3 as next digit of the result. 
Result so far: 1193.0
Subtracting 1860 from 1971 leaves us with 111.
Include the next digit (3) from the dividend after 111, then repeat: 1113 / 620

Going ahead to step 7:
1113 divided by 620 is 1 with a remainder of 493.
The number 1 becomes the next digit in our result. 
Result so far: 11931.0
If we take 620 away from 1113, we end up with 493.
Include the next digit (9) from the dividend after 493, then repeat: 4939 / 620

Step 8:
The number 620 fits into 4939 7 times, leaving a remainder of 599.
The next digit of our result is 7. 
Result so far: 119317.0
If we take 4340 away from 4939, we end up with 599.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5990, and continue the process.

On to step 9:
5990 divided by 620 is 9 with a remainder of 410.
Record the quotient 9 as the next digit in the result. 
Result so far: 119317.9
Subtracting 5580 from 5990 leaves us with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Step 10:
When dividing 4100 by 620, we get 6 with a remainder of 380.
Write down 6 as next digit of the result. 
Result so far: 119317.96
If we subtract 3720 from 4100, we get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Moving on to step 11:
If we divide 3800 by 620, we get 6 and a remainder of 80.
Record the quotient 6 as the next digit in the result. 
Result so far: 119317.966
Deduct 3720 from 3800 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

After the division, we end up with 119317.966 and a remainder of 0.008.