A:
Positive:
1 x 4006404555 x 8012809147 x 8524265235 x 1704853449 x 8922952245 x 1784593797 x 10551518985 x 21103
Negative:
-1 x -400640455-5 x -80128091-47 x -8524265-235 x -1704853-449 x -892295-2245 x -178459-3797 x -105515-18985 x -21103
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 400,640,455, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 400,640,455 | |
| -1 | -400,640,455 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 400,640,455.
Example:
1 x 400,640,455 = 400,640,455
and
-1 x -400,640,455 = 400,640,455
Notice both answers equal 400,640,455
With that explanation out of the way, let's continue. Next, we take the number 400,640,455 and divide it by 2:
400,640,455 ÷ 2 = 200,320,227.5
If the quotient is a whole number, then 2 and 200,320,227.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 400,640,455 | |
| -1 | -400,640,455 |
Now, we try dividing 400,640,455 by 3:
400,640,455 ÷ 3 = 133,546,818.3333
If the quotient is a whole number, then 3 and 133,546,818.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 400,640,455 | |
| -1 | -400,640,455 |
Let's try dividing by 4:
400,640,455 ÷ 4 = 100,160,113.75
If the quotient is a whole number, then 4 and 100,160,113.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 400,640,455 | |
| -1 | 400,640,455 |
If you did it right, you will end up with this table:
| 1 | 5 | 47 | 235 | 449 | 2,245 | 3,797 | 18,985 | 21,103 | 105,515 | 178,459 | 892,295 | 1,704,853 | 8,524,265 | 80,128,091 | 400,640,455 |
| -1 | -5 | -47 | -235 | -449 | -2,245 | -3,797 | -18,985 | -21,103 | -105,515 | -178,459 | -892,295 | -1,704,853 | -8,524,265 | -80,128,091 | -400,640,455 |
Here are some more numbers to try:
Try the factor calculator