A:
Positive:
1 x 251783217 x 3596903113 x 222817139 x 181139229 x 109949791 x 31831973 x 258771603 x 15707
Negative:
-1 x -25178321-7 x -3596903-113 x -222817-139 x -181139-229 x -109949-791 x -31831-973 x -25877-1603 x -15707
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 25,178,321, 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 | 25,178,321 | |
| -1 | -25,178,321 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,178,321.
Example:
1 x 25,178,321 = 25,178,321
and
-1 x -25,178,321 = 25,178,321
Notice both answers equal 25,178,321
With that explanation out of the way, let's continue. Next, we take the number 25,178,321 and divide it by 2:
25,178,321 ÷ 2 = 12,589,160.5
If the quotient is a whole number, then 2 and 12,589,160.5 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 | 25,178,321 | |
| -1 | -25,178,321 |
Now, we try dividing 25,178,321 by 3:
25,178,321 ÷ 3 = 8,392,773.6667
If the quotient is a whole number, then 3 and 8,392,773.6667 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 | 25,178,321 | |
| -1 | -25,178,321 |
Let's try dividing by 4:
25,178,321 ÷ 4 = 6,294,580.25
If the quotient is a whole number, then 4 and 6,294,580.25 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 | 25,178,321 | |
| -1 | 25,178,321 |
If you did it right, you will end up with this table:
| 1 | 7 | 113 | 139 | 229 | 791 | 973 | 1,603 | 15,707 | 25,877 | 31,831 | 109,949 | 181,139 | 222,817 | 3,596,903 | 25,178,321 |
| -1 | -7 | -113 | -139 | -229 | -791 | -973 | -1,603 | -15,707 | -25,877 | -31,831 | -109,949 | -181,139 | -222,817 | -3,596,903 | -25,178,321 |
Here are some more numbers to try:
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