A:
Positive:
1 x 4022156397 x 5745937761 x 659369971 x 5665009427 x 941957497 x 8092874331 x 9286913267 x 30317
Negative:
-1 x -402215639-7 x -57459377-61 x -6593699-71 x -5665009-427 x -941957-497 x -809287-4331 x -92869-13267 x -30317
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 402,215,639, 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 | 402,215,639 | |
| -1 | -402,215,639 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 402,215,639.
Example:
1 x 402,215,639 = 402,215,639
and
-1 x -402,215,639 = 402,215,639
Notice both answers equal 402,215,639
With that explanation out of the way, let's continue. Next, we take the number 402,215,639 and divide it by 2:
402,215,639 ÷ 2 = 201,107,819.5
If the quotient is a whole number, then 2 and 201,107,819.5 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 | 402,215,639 | |
| -1 | -402,215,639 |
Now, we try dividing 402,215,639 by 3:
402,215,639 ÷ 3 = 134,071,879.6667
If the quotient is a whole number, then 3 and 134,071,879.6667 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 | 402,215,639 | |
| -1 | -402,215,639 |
Let's try dividing by 4:
402,215,639 ÷ 4 = 100,553,909.75
If the quotient is a whole number, then 4 and 100,553,909.75 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 | 402,215,639 | |
| -1 | 402,215,639 |
If you did it right, you will end up with this table:
| 1 | 7 | 61 | 71 | 427 | 497 | 4,331 | 13,267 | 30,317 | 92,869 | 809,287 | 941,957 | 5,665,009 | 6,593,699 | 57,459,377 | 402,215,639 |
| -1 | -7 | -61 | -71 | -427 | -497 | -4,331 | -13,267 | -30,317 | -92,869 | -809,287 | -941,957 | -5,665,009 | -6,593,699 | -57,459,377 | -402,215,639 |
Here are some more numbers to try:
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