We're dividing 53689576 by 399 
We're looking to find how many times 399 goes into 53689576.

Advancing to step 1:
The number 399 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 399

Advancing to step 2:
53 divided by 399 is 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Grab the next digit (6) from the dividend, add it to 53, then carry on: 536 / 399

On to step 3:
The number 399 fits into 536 1 times, leaving a remainder of 137.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 399 away from 536, we end up with 137.
Include the next digit (8) from the dividend after 137, then repeat: 1378 / 399

Advancing to step 4:
If we divide 1378 by 399, we get 3 and a remainder of 181.
Write down 3 as next digit of the result. 
Result so far: 13.0
Deduct 1197 from 1378 and we're left with 181.
Fetch the next digit (9) from the dividend, attach it to 181 and continue: 1819 / 399

Going ahead to step 5:
399 goes into 1819 4 times with a remainder of 223.
Use 4 as the next digit of our solution. 
Result so far: 134.0
If we take 1596 away from 1819, we end up with 223.
Take the next digit (5) from the dividend and append it to 223, then repeat: 2235 / 399

Step 6:
When dividing 2235 by 399, we get 5 with a remainder of 240.
Put 5 as the next digit of the answer. 
Result so far: 1345.0
If we take 1995 away from 2235, we end up with 240.
Include the next digit (7) from the dividend after 240, then repeat: 2407 / 399

On to step 7:
The number 399 fits into 2407 6 times, leaving a remainder of 13.
Write down 6 as next digit of the result. 
Result so far: 13456.0
The remainder is 13 after subtracting 2394 from 2407.
Append the next digit (6) from the dividend to 13 and continue with: 136 / 399

Moving on to step 8:
When dividing 136 by 399, we get 0 with a remainder of 136.
Use 0 as the next digit of our solution. 
Result so far: 134560.0
The remainder is 136 after subtracting 0 from 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

On to step 9:
399 can be fit into 1360 3 times, resulting in a remainder of 163.
Use 3 as the next digit of our solution. 
Result so far: 134560.3
Subtracting 1197 from 1360 leaves us with 163.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1630, and continue the process.

Moving on to step 10:
1630 divided by 399 is 4 with a remainder of 34.
Use 4 as the next digit of our solution. 
Result so far: 134560.34
The remainder is 34 after subtracting 1596 from 1630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 11:
340 divided by 399 is 0 with a remainder of 340.
Write down 0 as next digit of the result. 
Result so far: 134560.34
The remainder is 340 after subtracting 0 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 12:
399 goes into 3400 8 times with a remainder of 208.
The number 8 becomes the next digit in our result. 
Result so far: 134560.3408
Subtracting 3192 from 3400 leaves us with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Let's proceed to step 13:
399 can be fit into 2080 5 times, resulting in a remainder of 85.
The number 5 becomes the next digit in our result. 
Result so far: 134560.34085
The remainder is 85 after subtracting 1995 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 14:
When dividing 850 by 399, we get 2 with a remainder of 52.
Use 2 as the next digit of our solution. 
Result so far: 134560.340852
Subtracting 798 from 850 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 15:
520 divided by 399 is 1 with a remainder of 121.
The next digit of our result is 1. 
Result so far: 134560.3408521
Subtracting 399 from 520 leaves us with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Let's proceed to step 16:
399 can be fit into 1210 3 times, resulting in a remainder of 13.
Use 3 as the next digit of our solution. 
Result so far: 134560.34085213
If we take 1197 away from 1210, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

After the division, we end up with 134560.34085213 and a remainder of 1.3e-08.