We look at the division of 61147845 by 578 
The aim is to understand the frequency of 578 in 61147845.

On to step 1:
When dividing 6 by 578, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 578

Advancing to step 2:
If we divide 61 by 578, we get 0 and a remainder of 61.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 61 after subtracting 0 from 61.
Take the next digit (1) from the dividend and append it to 61, then repeat: 611 / 578

Step 3:
611 divided by 578 is 1 with a remainder of 33.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 578 from 611 leaves us with 33.
Take the next digit (4) from the dividend and append it to 33, then repeat: 334 / 578

Step 4:
If we divide 334 by 578, we get 0 and a remainder of 334.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we subtract 0 from 334, we get 334.
Grab the next digit (7) from the dividend, add it to 334, then carry on: 3347 / 578

Moving on to step 5:
The number 578 fits into 3347 5 times, leaving a remainder of 457.
The next digit of our result is 5. 
Result so far: 105.0
The remainder is 457 after subtracting 2890 from 3347.
Take the next digit (8) from the dividend and append it to 457, then repeat: 4578 / 578

Let's proceed to step 6:
If we divide 4578 by 578, we get 7 and a remainder of 532.
Record the quotient 7 as the next digit in the result. 
Result so far: 1057.0
Subtract 4046 from 4578 to get 532.
Bring next digit (4) of the dividend behind the 532 and repeat the process: 5324 / 578

Step 7:
5324 divided by 578 is 9 with a remainder of 122.
Write down 9 as next digit of the result. 
Result so far: 10579.0
Subtracting 5202 from 5324 leaves us with 122.
Fetch the next digit (5) from the dividend, attach it to 122 and continue: 1225 / 578

On to step 8:
1225 divided by 578 is 2 with a remainder of 69.
The next digit of our result is 2. 
Result so far: 105792.0
Deduct 1156 from 1225 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 9:
If we divide 690 by 578, we get 1 and a remainder of 112.
Write down 1 as next digit of the result. 
Result so far: 105792.1
The remainder is 112 after subtracting 578 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Moving on to step 10:
578 goes into 1120 1 times with a remainder of 542.
Put 1 as the next digit of the answer. 
Result so far: 105792.11
Subtract 578 from 1120 to get 542.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

After the division, we end up with 105792.11 and a remainder of 0.542.