A:
Positive:
1 x 251457855 x 50291577 x 359225523 x 109329535 x 718451115 x 218659161 x 156185805 x 31237
Negative:
-1 x -25145785-5 x -5029157-7 x -3592255-23 x -1093295-35 x -718451-115 x -218659-161 x -156185-805 x -31237
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 25,145,785, 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 | 25,145,785 | |
| -1 | -25,145,785 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,145,785.
Example:
1 x 25,145,785 = 25,145,785
and
-1 x -25,145,785 = 25,145,785
Notice both answers equal 25,145,785
With that explanation out of the way, let's continue. Next, we take the number 25,145,785 and divide it by 2:
25,145,785 ÷ 2 = 12,572,892.5
If the quotient is a whole number, then 2 and 12,572,892.5 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 | 25,145,785 | |
| -1 | -25,145,785 |
Now, we try dividing 25,145,785 by 3:
25,145,785 ÷ 3 = 8,381,928.3333
If the quotient is a whole number, then 3 and 8,381,928.3333 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 | 25,145,785 | |
| -1 | -25,145,785 |
Let's try dividing by 4:
25,145,785 ÷ 4 = 6,286,446.25
If the quotient is a whole number, then 4 and 6,286,446.25 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 | 25,145,785 | |
| -1 | 25,145,785 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 23 | 35 | 115 | 161 | 805 | 31,237 | 156,185 | 218,659 | 718,451 | 1,093,295 | 3,592,255 | 5,029,157 | 25,145,785 |
| -1 | -5 | -7 | -23 | -35 | -115 | -161 | -805 | -31,237 | -156,185 | -218,659 | -718,451 | -1,093,295 | -3,592,255 | -5,029,157 | -25,145,785 |
Here are some more numbers to try:
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