We look at the division of 15869600 by 581 
The aim is to understand the frequency of 581 in 15869600.

On to step 1:
When dividing 1 by 581, we get 0 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.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 581

Going ahead to step 2:
When dividing 15 by 581, we get 0 with a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 581

On to step 3:
The number 581 fits into 158 0 times, leaving a remainder of 158.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 158, we end up with 158.
Fetch the next digit (6) from the dividend, attach it to 158 and continue: 1586 / 581

Advancing to step 4:
1586 divided by 581 is 2 with a remainder of 424.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 1162 from 1586 leaves us with 424.
Take the next digit (9) from the dividend and append it to 424, then repeat: 4249 / 581

On to step 5:
581 goes into 4249 7 times with a remainder of 182.
The next digit of our result is 7. 
Result so far: 27.0
The remainder is 182 after subtracting 4067 from 4249.
Fetch the next digit (6) from the dividend, attach it to 182 and continue: 1826 / 581

Advancing to step 6:
1826 divided by 581 is 3 with a remainder of 83.
Use 3 as the next digit of our solution. 
Result so far: 273.0
If we take 1743 away from 1826, we end up with 83.
Bring next digit (0) of the dividend behind the 83 and repeat the process: 830 / 581

On to step 7:
830 divided by 581 is 1 with a remainder of 249.
Write down 1 as next digit of the result. 
Result so far: 2731.0
The remainder is 249 after subtracting 581 from 830.
Take the next digit (0) from the dividend and append it to 249, then repeat: 2490 / 581

Going ahead to step 8:
When dividing 2490 by 581, we get 4 with a remainder of 166.
Use 4 as the next digit of our solution. 
Result so far: 27314.0
The remainder is 166 after subtracting 2324 from 2490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Step 9:
If we divide 1660 by 581, we get 2 and a remainder of 498.
Record the quotient 2 as the next digit in the result. 
Result so far: 27314.2
If we subtract 1162 from 1660, we get 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Advancing to step 10:
581 can be fit into 4980 8 times, resulting in a remainder of 332.
Record the quotient 8 as the next digit in the result. 
Result so far: 27314.28
Deduct 4648 from 4980 and we're left with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Let's proceed to step 11:
581 can be fit into 3320 5 times, resulting in a remainder of 415.
Put 5 as the next digit of the answer. 
Result so far: 27314.285
Deduct 2905 from 3320 and we're left with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Moving on to step 12:
If we divide 4150 by 581, we get 7 and a remainder of 83.
The next digit of our result is 7. 
Result so far: 27314.2857
Deduct 4067 from 4150 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Step 13:
When dividing 830 by 581, we get 1 with a remainder of 249.
Put 1 as the next digit of the answer. 
Result so far: 27314.28571
The remainder is 249 after subtracting 581 from 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2490, and continue the process.

On to step 14:
When dividing 2490 by 581, we get 4 with a remainder of 166.
Write down 4 as next digit of the result. 
Result so far: 27314.285714
If we subtract 2324 from 2490, we get 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Moving on to step 15:
581 goes into 1660 2 times with a remainder of 498.
Write down 2 as next digit of the result. 
Result so far: 27314.2857142
If we subtract 1162 from 1660, we get 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Moving on to step 16:
581 goes into 4980 8 times with a remainder of 332.
Record the quotient 8 as the next digit in the result. 
Result so far: 27314.28571428
If we subtract 4648 from 4980, we get 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

The quotient of the division is 27314.28571428, and the remainder is 3.32e-07.