We look at the division of 72774793 by 509 
The aim is to understand the frequency of 509 in 72774793.

Going ahead to step 1:
7 divided by 509 is 0 with 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.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 509

Let's proceed to step 2:
509 goes into 72 0 times with a remainder of 72.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Bring next digit (7) of the dividend behind the 72 and repeat the process: 727 / 509

Moving on to step 3:
727 divided by 509 is 1 with a remainder of 218.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 509 from 727 leaves us with 218.
Fetch the next digit (7) from the dividend, attach it to 218 and continue: 2187 / 509

Let's proceed to step 4:
509 goes into 2187 4 times with a remainder of 151.
Write down 4 as next digit of the result. 
Result so far: 14.0
The remainder is 151 after subtracting 2036 from 2187.
Append the next digit (4) from the dividend to 151 and continue with: 1514 / 509

Moving on to step 5:
If we divide 1514 by 509, we get 2 and a remainder of 496.
Record the quotient 2 as the next digit in the result. 
Result so far: 142.0
Deduct 1018 from 1514 and we're left with 496.
Bring next digit (7) of the dividend behind the 496 and repeat the process: 4967 / 509

Going ahead to step 6:
4967 divided by 509 is 9 with a remainder of 386.
The next digit of our result is 9. 
Result so far: 1429.0
The remainder is 386 after subtracting 4581 from 4967.
Include the next digit (9) from the dividend after 386, then repeat: 3869 / 509

Advancing to step 7:
509 goes into 3869 7 times with a remainder of 306.
Use 7 as the next digit of our solution. 
Result so far: 14297.0
Subtract 3563 from 3869 to get 306.
Include the next digit (3) from the dividend after 306, then repeat: 3063 / 509

Going ahead to step 8:
The number 509 fits into 3063 6 times, leaving a remainder of 9.
Record the quotient 6 as the next digit in the result. 
Result so far: 142976.0
The remainder is 9 after subtracting 3054 from 3063.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 9:
509 can be fit into 90 0 times, resulting in a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 142976.0
If we take 0 away from 90, we end up with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 10:
When dividing 900 by 509, we get 1 with a remainder of 391.
The number 1 becomes the next digit in our result. 
Result so far: 142976.01
The remainder is 391 after subtracting 509 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

Moving on to step 11:
509 goes into 3910 7 times with a remainder of 347.
The number 7 becomes the next digit in our result. 
Result so far: 142976.017
If we take 3563 away from 3910, we end up with 347.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3470, and continue the process.

On to step 12:
509 goes into 3470 6 times with a remainder of 416.
Put 6 as the next digit of the answer. 
Result so far: 142976.0176
Deduct 3054 from 3470 and we're left with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Let's proceed to step 13:
509 goes into 4160 8 times with a remainder of 88.
The next digit of our result is 8. 
Result so far: 142976.01768
Subtract 4072 from 4160 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Step 14:
509 goes into 880 1 times with a remainder of 371.
The number 1 becomes the next digit in our result. 
Result so far: 142976.017681
If we subtract 509 from 880, we get 371.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3710, and continue the process.

Moving on to step 15:
The number 509 fits into 3710 7 times, leaving a remainder of 147.
The next digit of our result is 7. 
Result so far: 142976.0176817
If we subtract 3563 from 3710, we get 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Moving on to step 16:
1470 divided by 509 is 2 with a remainder of 452.
Record the quotient 2 as the next digit in the result. 
Result so far: 142976.01768172
If we subtract 1018 from 1470, we get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Our division results in 142976.01768172 with a remaining 4.52e-07.