25405630 divided by 647 
The aim is to understand the frequency of 647 in 25405630.

Going ahead to step 1:
When dividing 2 by 647, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 647

On to step 2:
25 divided by 647 is 0 with a remainder of 25.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Take the next digit (4) from the dividend and append it to 25, then repeat: 254 / 647

Step 3:
254 divided by 647 is 0 with a remainder of 254.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 254 after subtracting 0 from 254.
Include the next digit (0) from the dividend after 254, then repeat: 2540 / 647

Let's proceed to step 4:
647 can be fit into 2540 3 times, resulting in a remainder of 599.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 1941 from 2540, we get 599.
Take the next digit (5) from the dividend and append it to 599, then repeat: 5995 / 647

Advancing to step 5:
647 can be fit into 5995 9 times, resulting in a remainder of 172.
Put 9 as the next digit of the answer. 
Result so far: 39.0
Subtract 5823 from 5995 to get 172.
Grab the next digit (6) from the dividend, add it to 172, then carry on: 1726 / 647

Step 6:
If we divide 1726 by 647, we get 2 and a remainder of 432.
Record the quotient 2 as the next digit in the result. 
Result so far: 392.0
If we take 1294 away from 1726, we end up with 432.
Grab the next digit (3) from the dividend, add it to 432, then carry on: 4323 / 647

Moving on to step 7:
When dividing 4323 by 647, we get 6 with a remainder of 441.
The next digit of our result is 6. 
Result so far: 3926.0
If we take 3882 away from 4323, we end up with 441.
Bring next digit (0) of the dividend behind the 441 and repeat the process: 4410 / 647

Step 8:
The number 647 fits into 4410 6 times, leaving a remainder of 528.
The number 6 becomes the next digit in our result. 
Result so far: 39266.0
The remainder is 528 after subtracting 3882 from 4410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Let's proceed to step 9:
647 can be fit into 5280 8 times, resulting in a remainder of 104.
The number 8 becomes the next digit in our result. 
Result so far: 39266.8
If we subtract 5176 from 5280, we get 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Step 10:
647 goes into 1040 1 times with a remainder of 393.
The number 1 becomes the next digit in our result. 
Result so far: 39266.81
If we subtract 647 from 1040, we get 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

On to step 11:
The number 647 fits into 3930 6 times, leaving a remainder of 48.
Record the quotient 6 as the next digit in the result. 
Result so far: 39266.816
Subtracting 3882 from 3930 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 12:
If we divide 480 by 647, we get 0 and a remainder of 480.
The next digit of our result is 0. 
Result so far: 39266.816
If we take 0 away from 480, we end up with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Step 13:
If we divide 4800 by 647, we get 7 and a remainder of 271.
Write down 7 as next digit of the result. 
Result so far: 39266.81607
The remainder is 271 after subtracting 4529 from 4800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2710, and continue the process.

On to step 14:
When dividing 2710 by 647, we get 4 with a remainder of 122.
The next digit of our result is 4. 
Result so far: 39266.816074
The remainder is 122 after subtracting 2588 from 2710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Step 15:
When dividing 1220 by 647, we get 1 with a remainder of 573.
Put 1 as the next digit of the answer. 
Result so far: 39266.8160741
If we take 647 away from 1220, we end up with 573.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5730, and continue the process.

On to step 16:
647 goes into 5730 8 times with a remainder of 554.
Put 8 as the next digit of the answer. 
Result so far: 39266.81607418
If we take 5176 away from 5730, we end up with 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

The final result is 39266.81607418 with a remainder of 5.54e-07.