We look at the division of 690597 by 26 
The aim is to understand the frequency of 26 in 690597.

Let's proceed to step 1:
When dividing 6 by 26, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (9) from the dividend, attach it to 6 and continue: 69 / 26

On to step 2:
26 can be fit into 69 2 times, resulting in a remainder of 17.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 52 from 69 and we're left with 17.
Bring next digit (0) of the dividend behind the 17 and repeat the process: 170 / 26

Let's proceed to step 3:
170 divided by 26 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
Subtract 156 from 170 to get 14.
Take the next digit (5) from the dividend and append it to 14, then repeat: 145 / 26

Advancing to step 4:
When dividing 145 by 26, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 265.0
Subtracting 130 from 145 leaves us with 15.
Include the next digit (9) from the dividend after 15, then repeat: 159 / 26

Moving on to step 5:
The number 26 fits into 159 6 times, leaving a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 2656.0
If we take 156 away from 159, we end up with 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 26

Moving on to step 6:
26 goes into 37 1 times with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 26561.0
If we subtract 26 from 37, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 7:
The number 26 fits into 110 4 times, leaving a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 26561.4
Subtracting 104 from 110 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
If we divide 60 by 26, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 26561.42
The remainder is 8 after subtracting 52 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
The number 26 fits into 80 3 times, leaving a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 26561.423
Subtracting 78 from 80 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 10:
20 divided by 26 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 26561.423
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
26 can be fit into 200 7 times, resulting in a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 26561.42307
Deduct 182 from 200 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 12:
The number 26 fits into 180 6 times, leaving a remainder of 24.
The next digit of our result is 6. 
Result so far: 26561.423076
The remainder is 24 after subtracting 156 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 13:
When dividing 240 by 26, we get 9 with a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 26561.4230769
Deduct 234 from 240 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 14:
60 divided by 26 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 26561.42307692
Subtracting 52 from 60 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 26561.42307692, with a leftover of 8e-09.