A:
Positive:
1 x 4007157077 x 5724510129 x 13817783203 x 1973969733 x 5466792693 x 1487995131 x 7809718851 x 21257
Negative:
-1 x -400715707-7 x -57245101-29 x -13817783-203 x -1973969-733 x -546679-2693 x -148799-5131 x -78097-18851 x -21257
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 400,715,707, 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 | 400,715,707 | |
| -1 | -400,715,707 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 400,715,707.
Example:
1 x 400,715,707 = 400,715,707
and
-1 x -400,715,707 = 400,715,707
Notice both answers equal 400,715,707
With that explanation out of the way, let's continue. Next, we take the number 400,715,707 and divide it by 2:
400,715,707 ÷ 2 = 200,357,853.5
If the quotient is a whole number, then 2 and 200,357,853.5 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 | 400,715,707 | |
| -1 | -400,715,707 |
Now, we try dividing 400,715,707 by 3:
400,715,707 ÷ 3 = 133,571,902.3333
If the quotient is a whole number, then 3 and 133,571,902.3333 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 | 400,715,707 | |
| -1 | -400,715,707 |
Let's try dividing by 4:
400,715,707 ÷ 4 = 100,178,926.75
If the quotient is a whole number, then 4 and 100,178,926.75 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 | 400,715,707 | |
| -1 | 400,715,707 |
If you did it right, you will end up with this table:
| 1 | 7 | 29 | 203 | 733 | 2,693 | 5,131 | 18,851 | 21,257 | 78,097 | 148,799 | 546,679 | 1,973,969 | 13,817,783 | 57,245,101 | 400,715,707 |
| -1 | -7 | -29 | -203 | -733 | -2,693 | -5,131 | -18,851 | -21,257 | -78,097 | -148,799 | -546,679 | -1,973,969 | -13,817,783 | -57,245,101 | -400,715,707 |
Here are some more numbers to try:
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