A:
Positive:
1 x 2872407237 x 4103438911 x 2611279377 x 3730399173 x 16603511211 x 2371931903 x 15094113321 x 21563
Negative:
-1 x -287240723-7 x -41034389-11 x -26112793-77 x -3730399-173 x -1660351-1211 x -237193-1903 x -150941-13321 x -21563
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 287,240,723, 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 | 287,240,723 | |
| -1 | -287,240,723 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 287,240,723.
Example:
1 x 287,240,723 = 287,240,723
and
-1 x -287,240,723 = 287,240,723
Notice both answers equal 287,240,723
With that explanation out of the way, let's continue. Next, we take the number 287,240,723 and divide it by 2:
287,240,723 ÷ 2 = 143,620,361.5
If the quotient is a whole number, then 2 and 143,620,361.5 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 | 287,240,723 | |
| -1 | -287,240,723 |
Now, we try dividing 287,240,723 by 3:
287,240,723 ÷ 3 = 95,746,907.6667
If the quotient is a whole number, then 3 and 95,746,907.6667 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 | 287,240,723 | |
| -1 | -287,240,723 |
Let's try dividing by 4:
287,240,723 ÷ 4 = 71,810,180.75
If the quotient is a whole number, then 4 and 71,810,180.75 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 | 287,240,723 | |
| -1 | 287,240,723 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 173 | 1,211 | 1,903 | 13,321 | 21,563 | 150,941 | 237,193 | 1,660,351 | 3,730,399 | 26,112,793 | 41,034,389 | 287,240,723 |
| -1 | -7 | -11 | -77 | -173 | -1,211 | -1,903 | -13,321 | -21,563 | -150,941 | -237,193 | -1,660,351 | -3,730,399 | -26,112,793 | -41,034,389 | -287,240,723 |
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