A:
Positive:
1 x 251582155 x 503164317 x 147989541 x 61361585 x 295979205 x 122723697 x 360953485 x 7219
Negative:
-1 x -25158215-5 x -5031643-17 x -1479895-41 x -613615-85 x -295979-205 x -122723-697 x -36095-3485 x -7219
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 25,158,215, 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 | 25,158,215 | |
| -1 | -25,158,215 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 25,158,215.
Example:
1 x 25,158,215 = 25,158,215
and
-1 x -25,158,215 = 25,158,215
Notice both answers equal 25,158,215
With that explanation out of the way, let's continue. Next, we take the number 25,158,215 and divide it by 2:
25,158,215 ÷ 2 = 12,579,107.5
If the quotient is a whole number, then 2 and 12,579,107.5 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 | 25,158,215 | |
| -1 | -25,158,215 |
Now, we try dividing 25,158,215 by 3:
25,158,215 ÷ 3 = 8,386,071.6667
If the quotient is a whole number, then 3 and 8,386,071.6667 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 | 25,158,215 | |
| -1 | -25,158,215 |
Let's try dividing by 4:
25,158,215 ÷ 4 = 6,289,553.75
If the quotient is a whole number, then 4 and 6,289,553.75 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 | 25,158,215 | |
| -1 | 25,158,215 |
If you did it right, you will end up with this table:
| 1 | 5 | 17 | 41 | 85 | 205 | 697 | 3,485 | 7,219 | 36,095 | 122,723 | 295,979 | 613,615 | 1,479,895 | 5,031,643 | 25,158,215 |
| -1 | -5 | -17 | -41 | -85 | -205 | -697 | -3,485 | -7,219 | -36,095 | -122,723 | -295,979 | -613,615 | -1,479,895 | -5,031,643 | -25,158,215 |
Here are some more numbers to try:
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