26535604 divided by 409 
The aim is to understand the frequency of 409 in 26535604.

On to step 1:
The number 409 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 409

Step 2:
26 divided by 409 is 0 with a remainder of 26.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 26, we get 26.
Bring next digit (5) of the dividend behind the 26 and repeat the process: 265 / 409

Moving on to step 3:
409 can be fit into 265 0 times, resulting in a remainder of 265.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 265, we end up with 265.
Bring next digit (3) of the dividend behind the 265 and repeat the process: 2653 / 409

Moving on to step 4:
409 can be fit into 2653 6 times, resulting in a remainder of 199.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 2454 from 2653 to get 199.
Fetch the next digit (5) from the dividend, attach it to 199 and continue: 1995 / 409

Let's proceed to step 5:
1995 divided by 409 is 4 with a remainder of 359.
The next digit of our result is 4. 
Result so far: 64.0
The remainder is 359 after subtracting 1636 from 1995.
Append the next digit (6) from the dividend to 359 and continue with: 3596 / 409

Advancing to step 6:
409 goes into 3596 8 times with a remainder of 324.
The next digit of our result is 8. 
Result so far: 648.0
Deduct 3272 from 3596 and we're left with 324.
Include the next digit (0) from the dividend after 324, then repeat: 3240 / 409

On to step 7:
If we divide 3240 by 409, we get 7 and a remainder of 377.
Record the quotient 7 as the next digit in the result. 
Result so far: 6487.0
Deduct 2863 from 3240 and we're left with 377.
Grab the next digit (4) from the dividend, add it to 377, then carry on: 3774 / 409

Moving on to step 8:
409 goes into 3774 9 times with a remainder of 93.
Use 9 as the next digit of our solution. 
Result so far: 64879.0
Subtract 3681 from 3774 to get 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Moving on to step 9:
When dividing 930 by 409, we get 2 with a remainder of 112.
The next digit of our result is 2. 
Result so far: 64879.2
Subtracting 818 from 930 leaves us with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

On to step 10:
1120 divided by 409 is 2 with a remainder of 302.
Use 2 as the next digit of our solution. 
Result so far: 64879.22
Subtracting 818 from 1120 leaves us with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

The final result is 64879.22 with a remainder of 0.302.