39315346 ÷ 621 
We want to figure out the number of times 39315346 can be divided by 621.

Let's proceed to step 1:
621 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 621

Advancing to step 2:
621 goes into 39 0 times with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Append the next digit (3) from the dividend to 39 and continue with: 393 / 621

Going ahead to step 3:
The number 621 fits into 393 0 times, leaving a remainder of 393.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 393 to get 393.
Fetch the next digit (1) from the dividend, attach it to 393 and continue: 3931 / 621

Going ahead to step 4:
621 goes into 3931 6 times with a remainder of 205.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 3726 from 3931 to get 205.
Grab the next digit (5) from the dividend, add it to 205, then carry on: 2055 / 621

Moving on to step 5:
When dividing 2055 by 621, we get 3 with a remainder of 192.
The number 3 becomes the next digit in our result. 
Result so far: 63.0
The remainder is 192 after subtracting 1863 from 2055.
Bring next digit (3) of the dividend behind the 192 and repeat the process: 1923 / 621

Step 6:
The number 621 fits into 1923 3 times, leaving a remainder of 60.
Put 3 as the next digit of the answer. 
Result so far: 633.0
Subtracting 1863 from 1923 leaves us with 60.
Bring next digit (4) of the dividend behind the 60 and repeat the process: 604 / 621

Moving on to step 7:
604 divided by 621 is 0 with a remainder of 604.
The next digit of our result is 0. 
Result so far: 6330.0
The remainder is 604 after subtracting 0 from 604.
Append the next digit (6) from the dividend to 604 and continue with: 6046 / 621

Advancing to step 8:
The number 621 fits into 6046 9 times, leaving a remainder of 457.
Put 9 as the next digit of the answer. 
Result so far: 63309.0
Subtracting 5589 from 6046 leaves us with 457.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4570, and continue the process.

Advancing to step 9:
If we divide 4570 by 621, we get 7 and a remainder of 223.
Record the quotient 7 as the next digit in the result. 
Result so far: 63309.7
Subtracting 4347 from 4570 leaves us with 223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Advancing to step 10:
When dividing 2230 by 621, we get 3 with a remainder of 367.
Write down 3 as next digit of the result. 
Result so far: 63309.73
Subtract 1863 from 2230 to get 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Moving on to step 11:
621 goes into 3670 5 times with a remainder of 565.
Put 5 as the next digit of the answer. 
Result so far: 63309.735
Subtracting 3105 from 3670 leaves us with 565.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

Let's proceed to step 12:
If we divide 5650 by 621, we get 9 and a remainder of 61.
The next digit of our result is 9. 
Result so far: 63309.7359
Deduct 5589 from 5650 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 13:
621 can be fit into 610 0 times, resulting in a remainder of 610.
The next digit of our result is 0. 
Result so far: 63309.7359
Subtract 0 from 610 to get 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Let's proceed to step 14:
When dividing 6100 by 621, we get 9 with a remainder of 511.
Record the quotient 9 as the next digit in the result. 
Result so far: 63309.735909
The remainder is 511 after subtracting 5589 from 6100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

On to step 15:
5110 divided by 621 is 8 with a remainder of 142.
Put 8 as the next digit of the answer. 
Result so far: 63309.7359098
The remainder is 142 after subtracting 4968 from 5110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Moving on to step 16:
The number 621 fits into 1420 2 times, leaving a remainder of 178.
Put 2 as the next digit of the answer. 
Result so far: 63309.73590982
Subtracting 1242 from 1420 leaves us with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

In conclusion, the division gives 63309.73590982 with a balance of 1.78e-07.