640456 divided by 1 
Our goal is to divide 640456 by 1.

Advancing to step 1:
1 goes into 6 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
The remainder is 0 after subtracting 6 from 6.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 1

Moving on to step 2:
When dividing 4 by 1, we get 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 64.0
If we subtract 4 from 4, we get 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 1

Advancing to step 3:
The number 1 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 640.0
Deduct 0 from 0 and we're left with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 1

Going ahead to step 4:
When dividing 4 by 1, we get 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 6404.0
Subtract 4 from 4 to get 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 1

Going ahead to step 5:
If we divide 5 by 1, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 64045.0
Subtract 5 from 5 to get 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 1

Step 6:
6 divided by 1 is 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 640456.0
If we subtract 6 from 6, 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 7:
1 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 640456.0
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.

Let's proceed to step 8:
If we divide 0 by 1, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 640456.0
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.

The final outcome is 640456.0, with a leftover of 0.0.