Let's divide 25591839 by 869
The aim is to understand the frequency of 869 in 25591839.

Let's proceed to step 1:
When dividing 2 by 869, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 869

Moving on to step 2:
25 divided by 869 is 0 with a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Fetch the next digit (5) from the dividend, attach it to 25 and continue: 255 / 869

Moving on to step 3:
255 divided by 869 is 0 with a remainder of 255.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 255 after subtracting 0 from 255.
Grab the next digit (9) from the dividend, add it to 255, then carry on: 2559 / 869

Moving on to step 4:
When dividing 2559 by 869, we get 2 with a remainder of 821.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 1738 from 2559 to get 821.
Append the next digit (1) from the dividend to 821 and continue with: 8211 / 869

Advancing to step 5:
The number 869 fits into 8211 9 times, leaving a remainder of 390.
Write down 9 as next digit of the result. 
Result so far: 29.0
Deduct 7821 from 8211 and we're left with 390.
Bring next digit (8) of the dividend behind the 390 and repeat the process: 3908 / 869

On to step 6:
The number 869 fits into 3908 4 times, leaving a remainder of 432.
The number 4 becomes the next digit in our result. 
Result so far: 294.0
If we take 3476 away from 3908, we end up with 432.
Include the next digit (3) from the dividend after 432, then repeat: 4323 / 869

Going ahead to step 7:
If we divide 4323 by 869, we get 4 and a remainder of 847.
Record the quotient 4 as the next digit in the result. 
Result so far: 2944.0
Deduct 3476 from 4323 and we're left with 847.
Include the next digit (9) from the dividend after 847, then repeat: 8479 / 869

Moving on to step 8:
869 goes into 8479 9 times with a remainder of 658.
The next digit of our result is 9. 
Result so far: 29449.0
Subtract 7821 from 8479 to get 658.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6580, and continue the process.

Step 9:
869 can be fit into 6580 7 times, resulting in a remainder of 497.
Record the quotient 7 as the next digit in the result. 
Result so far: 29449.7
Subtract 6083 from 6580 to get 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

Step 10:
869 can be fit into 4970 5 times, resulting in a remainder of 625.
Record the quotient 5 as the next digit in the result. 
Result so far: 29449.75
Subtract 4345 from 4970 to get 625.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

Moving on to step 11:
If we divide 6250 by 869, we get 7 and a remainder of 167.
Use 7 as the next digit of our solution. 
Result so far: 29449.757
If we subtract 6083 from 6250, we get 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

On to step 12:
1670 divided by 869 is 1 with a remainder of 801.
Write down 1 as next digit of the result. 
Result so far: 29449.7571
Deduct 869 from 1670 and we're left with 801.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8010, and continue the process.

Let's proceed to step 13:
8010 divided by 869 is 9 with a remainder of 189.
The number 9 becomes the next digit in our result. 
Result so far: 29449.75719
Subtracting 7821 from 8010 leaves us with 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

Going ahead to step 14:
When dividing 1890 by 869, we get 2 with a remainder of 152.
The number 2 becomes the next digit in our result. 
Result so far: 29449.757192
If we take 1738 away from 1890, we end up with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Let's proceed to step 15:
The number 869 fits into 1520 1 times, leaving a remainder of 651.
The next digit of our result is 1. 
Result so far: 29449.7571921
The remainder is 651 after subtracting 869 from 1520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6510, and continue the process.

On to step 16:
869 can be fit into 6510 7 times, resulting in a remainder of 427.
Record the quotient 7 as the next digit in the result. 
Result so far: 29449.75719217
Subtract 6083 from 6510 to get 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4270, and continue the process.

The final outcome is 29449.75719217, with a leftover of 4.27e-07.