We look at the division of 17861323 by 623 
The aim is to understand the frequency of 623 in 17861323.

Let's proceed to step 1:
623 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 623

Advancing to step 2:
17 divided by 623 is 0 with a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 623

On to step 3:
When dividing 178 by 623, we get 0 with a remainder of 178.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 178 and we're left with 178.
Append the next digit (6) from the dividend to 178 and continue with: 1786 / 623

Step 4:
623 can be fit into 1786 2 times, resulting in a remainder of 540.
The next digit of our result is 2. 
Result so far: 2.0
If we take 1246 away from 1786, we end up with 540.
Grab the next digit (1) from the dividend, add it to 540, then carry on: 5401 / 623

Going ahead to step 5:
If we divide 5401 by 623, we get 8 and a remainder of 417.
Use 8 as the next digit of our solution. 
Result so far: 28.0
The remainder is 417 after subtracting 4984 from 5401.
Take the next digit (3) from the dividend and append it to 417, then repeat: 4173 / 623

Advancing to step 6:
623 can be fit into 4173 6 times, resulting in a remainder of 435.
The number 6 becomes the next digit in our result. 
Result so far: 286.0
Subtracting 3738 from 4173 leaves us with 435.
Append the next digit (2) from the dividend to 435 and continue with: 4352 / 623

Let's proceed to step 7:
4352 divided by 623 is 6 with a remainder of 614.
Write down 6 as next digit of the result. 
Result so far: 2866.0
Subtract 3738 from 4352 to get 614.
Grab the next digit (3) from the dividend, add it to 614, then carry on: 6143 / 623

On to step 8:
When dividing 6143 by 623, we get 9 with a remainder of 536.
Use 9 as the next digit of our solution. 
Result so far: 28669.0
The remainder is 536 after subtracting 5607 from 6143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Going ahead to step 9:
5360 divided by 623 is 8 with a remainder of 376.
Record the quotient 8 as the next digit in the result. 
Result so far: 28669.8
If we subtract 4984 from 5360, we get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Let's proceed to step 10:
623 goes into 3760 6 times with a remainder of 22.
The number 6 becomes the next digit in our result. 
Result so far: 28669.86
Subtract 3738 from 3760 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 11:
The number 623 fits into 220 0 times, leaving a remainder of 220.
Put 0 as the next digit of the answer. 
Result so far: 28669.86
Subtract 0 from 220 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Step 12:
623 goes into 2200 3 times with a remainder of 331.
Use 3 as the next digit of our solution. 
Result so far: 28669.8603
Deduct 1869 from 2200 and we're left with 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Step 13:
623 goes into 3310 5 times with a remainder of 195.
Use 5 as the next digit of our solution. 
Result so far: 28669.86035
If we take 3115 away from 3310, we end up with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Step 14:
1950 divided by 623 is 3 with a remainder of 81.
The number 3 becomes the next digit in our result. 
Result so far: 28669.860353
If we subtract 1869 from 1950, we get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 15:
If we divide 810 by 623, we get 1 and a remainder of 187.
The number 1 becomes the next digit in our result. 
Result so far: 28669.8603531
Subtract 623 from 810 to get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Going ahead to step 16:
If we divide 1870 by 623, we get 3 and a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 28669.86035313
If we take 1869 away from 1870, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final result is 28669.86035313 with a remainder of 1e-09.