A:
Positive:
1 x 256425055 x 51285017 x 366321535 x 732643197 x 130165985 x 260331379 x 185953719 x 6895
Negative:
-1 x -25642505-5 x -5128501-7 x -3663215-35 x -732643-197 x -130165-985 x -26033-1379 x -18595-3719 x -6895
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 25,642,505, 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 | 25,642,505 | |
| -1 | -25,642,505 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,642,505.
Example:
1 x 25,642,505 = 25,642,505
and
-1 x -25,642,505 = 25,642,505
Notice both answers equal 25,642,505
With that explanation out of the way, let's continue. Next, we take the number 25,642,505 and divide it by 2:
25,642,505 ÷ 2 = 12,821,252.5
If the quotient is a whole number, then 2 and 12,821,252.5 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 | 25,642,505 | |
| -1 | -25,642,505 |
Now, we try dividing 25,642,505 by 3:
25,642,505 ÷ 3 = 8,547,501.6667
If the quotient is a whole number, then 3 and 8,547,501.6667 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 | 25,642,505 | |
| -1 | -25,642,505 |
Let's try dividing by 4:
25,642,505 ÷ 4 = 6,410,626.25
If the quotient is a whole number, then 4 and 6,410,626.25 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 | 25,642,505 | |
| -1 | 25,642,505 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 197 | 985 | 1,379 | 3,719 | 6,895 | 18,595 | 26,033 | 130,165 | 732,643 | 3,663,215 | 5,128,501 | 25,642,505 |
| -1 | -5 | -7 | -35 | -197 | -985 | -1,379 | -3,719 | -6,895 | -18,595 | -26,033 | -130,165 | -732,643 | -3,663,215 | -5,128,501 | -25,642,505 |
Here are some more numbers to try:
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