6538858 divided by 578 
The aim is to understand the frequency of 578 in 6538858.

On to step 1:
The number 578 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 578

Moving on to step 2:
578 can be fit into 65 0 times, resulting in a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 65, we end up with 65.
Take the next digit (3) from the dividend and append it to 65, then repeat: 653 / 578

On to step 3:
If we divide 653 by 578, we get 1 and a remainder of 75.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 578 from 653 and we're left with 75.
Append the next digit (8) from the dividend to 75 and continue with: 758 / 578

On to step 4:
If we divide 758 by 578, we get 1 and a remainder of 180.
Write down 1 as next digit of the result. 
Result so far: 11.0
If we take 578 away from 758, we end up with 180.
Bring next digit (8) of the dividend behind the 180 and repeat the process: 1808 / 578

Let's proceed to step 5:
1808 divided by 578 is 3 with a remainder of 74.
The next digit of our result is 3. 
Result so far: 113.0
The remainder is 74 after subtracting 1734 from 1808.
Bring next digit (5) of the dividend behind the 74 and repeat the process: 745 / 578

Advancing to step 6:
When dividing 745 by 578, we get 1 with a remainder of 167.
Put 1 as the next digit of the answer. 
Result so far: 1131.0
Subtracting 578 from 745 leaves us with 167.
Fetch the next digit (8) from the dividend, attach it to 167 and continue: 1678 / 578

On to step 7:
When dividing 1678 by 578, we get 2 with a remainder of 522.
Record the quotient 2 as the next digit in the result. 
Result so far: 11312.0
Subtract 1156 from 1678 to get 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Let's proceed to step 8:
578 can be fit into 5220 9 times, resulting in a remainder of 18.
The number 9 becomes the next digit in our result. 
Result so far: 11312.9
Subtract 5202 from 5220 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 9:
578 can be fit into 180 0 times, resulting in a remainder of 180.
Use 0 as the next digit of our solution. 
Result so far: 11312.9
Subtracting 0 from 180 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 10:
When dividing 1800 by 578, we get 3 with a remainder of 66.
The number 3 becomes the next digit in our result. 
Result so far: 11312.903
Deduct 1734 from 1800 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 11:
660 divided by 578 is 1 with a remainder of 82.
The next digit of our result is 1. 
Result so far: 11312.9031
If we subtract 578 from 660, we get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 12:
If we divide 820 by 578, we get 1 and a remainder of 242.
Use 1 as the next digit of our solution. 
Result so far: 11312.90311
Deduct 578 from 820 and we're left with 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

The final result is 11312.90311 with a remainder of 0.000242.