A:
Positive:
1 x 281459755 x 562919511 x 255872513 x 216507525 x 112583955 x 51174565 x 433015143 x 196825275 x 102349325 x 86603715 x 393653575 x 7873
Negative:
-1 x -28145975-5 x -5629195-11 x -2558725-13 x -2165075-25 x -1125839-55 x -511745-65 x -433015-143 x -196825-275 x -102349-325 x -86603-715 x -39365-3575 x -7873
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 28,145,975, 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 | 28,145,975 | |
| -1 | -28,145,975 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 28,145,975.
Example:
1 x 28,145,975 = 28,145,975
and
-1 x -28,145,975 = 28,145,975
Notice both answers equal 28,145,975
With that explanation out of the way, let's continue. Next, we take the number 28,145,975 and divide it by 2:
28,145,975 ÷ 2 = 14,072,987.5
If the quotient is a whole number, then 2 and 14,072,987.5 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 | 28,145,975 | |
| -1 | -28,145,975 |
Now, we try dividing 28,145,975 by 3:
28,145,975 ÷ 3 = 9,381,991.6667
If the quotient is a whole number, then 3 and 9,381,991.6667 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 | 28,145,975 | |
| -1 | -28,145,975 |
Let's try dividing by 4:
28,145,975 ÷ 4 = 7,036,493.75
If the quotient is a whole number, then 4 and 7,036,493.75 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 | 28,145,975 | |
| -1 | 28,145,975 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 13 | 25 | 55 | 65 | 143 | 275 | 325 | 715 | 3,575 | 7,873 | 39,365 | 86,603 | 102,349 | 196,825 | 433,015 | 511,745 | 1,125,839 | 2,165,075 | 2,558,725 | 5,629,195 | 28,145,975 |
| -1 | -5 | -11 | -13 | -25 | -55 | -65 | -143 | -275 | -325 | -715 | -3,575 | -7,873 | -39,365 | -86,603 | -102,349 | -196,825 | -433,015 | -511,745 | -1,125,839 | -2,165,075 | -2,558,725 | -5,629,195 | -28,145,975 |
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