A:
Positive:
1 x 406387155 x 812774313 x 312605529 x 140133565 x 625211145 x 280267377 x 1077951885 x 21559
Negative:
-1 x -40638715-5 x -8127743-13 x -3126055-29 x -1401335-65 x -625211-145 x -280267-377 x -107795-1885 x -21559
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 40,638,715, 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 | 40,638,715 | |
| -1 | -40,638,715 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 40,638,715.
Example:
1 x 40,638,715 = 40,638,715
and
-1 x -40,638,715 = 40,638,715
Notice both answers equal 40,638,715
With that explanation out of the way, let's continue. Next, we take the number 40,638,715 and divide it by 2:
40,638,715 ÷ 2 = 20,319,357.5
If the quotient is a whole number, then 2 and 20,319,357.5 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 | 40,638,715 | |
| -1 | -40,638,715 |
Now, we try dividing 40,638,715 by 3:
40,638,715 ÷ 3 = 13,546,238.3333
If the quotient is a whole number, then 3 and 13,546,238.3333 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 | 40,638,715 | |
| -1 | -40,638,715 |
Let's try dividing by 4:
40,638,715 ÷ 4 = 10,159,678.75
If the quotient is a whole number, then 4 and 10,159,678.75 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 | 40,638,715 | |
| -1 | 40,638,715 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 29 | 65 | 145 | 377 | 1,885 | 21,559 | 107,795 | 280,267 | 625,211 | 1,401,335 | 3,126,055 | 8,127,743 | 40,638,715 |
| -1 | -5 | -13 | -29 | -65 | -145 | -377 | -1,885 | -21,559 | -107,795 | -280,267 | -625,211 | -1,401,335 | -3,126,055 | -8,127,743 | -40,638,715 |
Here are some more numbers to try:
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