28573301 ÷ 509 
The aim is to understand the frequency of 509 in 28573301.

Going ahead to step 1:
When dividing 2 by 509, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 509

Let's proceed to step 2:
If we divide 28 by 509, we get 0 and a remainder of 28.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 509

Going ahead to step 3:
509 goes into 285 0 times with a remainder of 285.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 285, we get 285.
Fetch the next digit (7) from the dividend, attach it to 285 and continue: 2857 / 509

Step 4:
509 goes into 2857 5 times with a remainder of 312.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 2545 away from 2857, we end up with 312.
Fetch the next digit (3) from the dividend, attach it to 312 and continue: 3123 / 509

Let's proceed to step 5:
The number 509 fits into 3123 6 times, leaving a remainder of 69.
The next digit of our result is 6. 
Result so far: 56.0
If we subtract 3054 from 3123, we get 69.
Fetch the next digit (3) from the dividend, attach it to 69 and continue: 693 / 509

On to step 6:
693 divided by 509 is 1 with a remainder of 184.
The next digit of our result is 1. 
Result so far: 561.0
Subtracting 509 from 693 leaves us with 184.
Take the next digit (0) from the dividend and append it to 184, then repeat: 1840 / 509

Moving on to step 7:
1840 divided by 509 is 3 with a remainder of 313.
Use 3 as the next digit of our solution. 
Result so far: 5613.0
The remainder is 313 after subtracting 1527 from 1840.
Grab the next digit (1) from the dividend, add it to 313, then carry on: 3131 / 509

Moving on to step 8:
If we divide 3131 by 509, we get 6 and a remainder of 77.
The number 6 becomes the next digit in our result. 
Result so far: 56136.0
If we subtract 3054 from 3131, we get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Step 9:
509 can be fit into 770 1 times, resulting in a remainder of 261.
The next digit of our result is 1. 
Result so far: 56136.1
Deduct 509 from 770 and we're left with 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

On to step 10:
If we divide 2610 by 509, we get 5 and a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 56136.15
If we take 2545 away from 2610, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 11:
The number 509 fits into 650 1 times, leaving a remainder of 141.
Write down 1 as next digit of the result. 
Result so far: 56136.151
If we take 509 away from 650, we end up with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Step 12:
1410 divided by 509 is 2 with a remainder of 392.
Put 2 as the next digit of the answer. 
Result so far: 56136.1512
If we subtract 1018 from 1410, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Let's proceed to step 13:
The number 509 fits into 3920 7 times, leaving a remainder of 357.
Record the quotient 7 as the next digit in the result. 
Result so far: 56136.15127
Subtract 3563 from 3920 to get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Step 14:
When dividing 3570 by 509, we get 7 with a remainder of 7.
The next digit of our result is 7. 
Result so far: 56136.151277
Subtract 3563 from 3570 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final result is 56136.151277 with a remainder of 7e-07.