621680 divided by 4 
Our goal is to divide 621680 by 4.

On to step 1:
4 goes into 6 1 times with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 4

Going ahead to step 2:
22 divided by 4 is 5 with a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we take 20 away from 22, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 4

On to step 3:
4 goes into 21 5 times with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 155.0
Deduct 20 from 21 and we're left with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 4

Let's proceed to step 4:
If we divide 16 by 4, we get 4 and a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 1554.0
If we take 16 away from 16, we end up with 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 4

Let's proceed to step 5:
8 divided by 4 is 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 15542.0
If we take 8 away from 8, we end up with 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 4

Moving on to step 6:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 155420.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
4 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 155420.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
When dividing 0 by 4, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 155420.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 155420.0 with a remaining 0.0.