A:
Positive:
1 x 2827156117 x 166303359 x 47917971 x 398191397 x 712131003 x 281871207 x 234234189 x 6749
Negative:
-1 x -28271561-17 x -1663033-59 x -479179-71 x -398191-397 x -71213-1003 x -28187-1207 x -23423-4189 x -6749
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 28,271,561, 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 | 28,271,561 | |
| -1 | -28,271,561 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 28,271,561.
Example:
1 x 28,271,561 = 28,271,561
and
-1 x -28,271,561 = 28,271,561
Notice both answers equal 28,271,561
With that explanation out of the way, let's continue. Next, we take the number 28,271,561 and divide it by 2:
28,271,561 ÷ 2 = 14,135,780.5
If the quotient is a whole number, then 2 and 14,135,780.5 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 | 28,271,561 | |
| -1 | -28,271,561 |
Now, we try dividing 28,271,561 by 3:
28,271,561 ÷ 3 = 9,423,853.6667
If the quotient is a whole number, then 3 and 9,423,853.6667 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 | 28,271,561 | |
| -1 | -28,271,561 |
Let's try dividing by 4:
28,271,561 ÷ 4 = 7,067,890.25
If the quotient is a whole number, then 4 and 7,067,890.25 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 | 28,271,561 | |
| -1 | 28,271,561 |
If you did it right, you will end up with this table:
| 1 | 17 | 59 | 71 | 397 | 1,003 | 1,207 | 4,189 | 6,749 | 23,423 | 28,187 | 71,213 | 398,191 | 479,179 | 1,663,033 | 28,271,561 |
| -1 | -17 | -59 | -71 | -397 | -1,003 | -1,207 | -4,189 | -6,749 | -23,423 | -28,187 | -71,213 | -398,191 | -479,179 | -1,663,033 | -28,271,561 |
Here are some more numbers to try:
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