We look at the division of 17597235 by 609 
The aim is to understand the frequency of 609 in 17597235.

Moving on to step 1:
If we divide 1 by 609, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 609

Moving on to step 2:
The number 609 fits into 17 0 times, leaving a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Append the next digit (5) from the dividend to 17 and continue with: 175 / 609

Advancing to step 3:
If we divide 175 by 609, we get 0 and a remainder of 175.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 175 and we're left with 175.
Take the next digit (9) from the dividend and append it to 175, then repeat: 1759 / 609

Going ahead to step 4:
The number 609 fits into 1759 2 times, leaving a remainder of 541.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 1218 from 1759 to get 541.
Include the next digit (7) from the dividend after 541, then repeat: 5417 / 609

Moving on to step 5:
When dividing 5417 by 609, we get 8 with a remainder of 545.
Write down 8 as next digit of the result. 
Result so far: 28.0
If we take 4872 away from 5417, we end up with 545.
Bring next digit (2) of the dividend behind the 545 and repeat the process: 5452 / 609

Moving on to step 6:
When dividing 5452 by 609, we get 8 with a remainder of 580.
The next digit of our result is 8. 
Result so far: 288.0
Deduct 4872 from 5452 and we're left with 580.
Include the next digit (3) from the dividend after 580, then repeat: 5803 / 609

Moving on to step 7:
5803 divided by 609 is 9 with a remainder of 322.
Write down 9 as next digit of the result. 
Result so far: 2889.0
Deduct 5481 from 5803 and we're left with 322.
Include the next digit (5) from the dividend after 322, then repeat: 3225 / 609

Advancing to step 8:
609 goes into 3225 5 times with a remainder of 180.
Write down 5 as next digit of the result. 
Result so far: 28895.0
If we take 3045 away from 3225, we end up with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Step 9:
609 can be fit into 1800 2 times, resulting in a remainder of 582.
Use 2 as the next digit of our solution. 
Result so far: 28895.2
If we subtract 1218 from 1800, we get 582.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

Let's proceed to step 10:
609 goes into 5820 9 times with a remainder of 339.
Put 9 as the next digit of the answer. 
Result so far: 28895.29
Subtracting 5481 from 5820 leaves us with 339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

On to step 11:
If we divide 3390 by 609, we get 5 and a remainder of 345.
Use 5 as the next digit of our solution. 
Result so far: 28895.295
The remainder is 345 after subtracting 3045 from 3390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Going ahead to step 12:
3450 divided by 609 is 5 with a remainder of 405.
The number 5 becomes the next digit in our result. 
Result so far: 28895.2955
If we take 3045 away from 3450, we end up with 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

After the division, we end up with 28895.2955 and a remainder of 0.00405.