A:
Positive:
1 x 287106055 x 57421217 x 410151511 x 261005535 x 82030355 x 52201177 x 372865385 x 74573
Negative:
-1 x -28710605-5 x -5742121-7 x -4101515-11 x -2610055-35 x -820303-55 x -522011-77 x -372865-385 x -74573
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 28,710,605, 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 | 28,710,605 | |
| -1 | -28,710,605 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 28,710,605.
Example:
1 x 28,710,605 = 28,710,605
and
-1 x -28,710,605 = 28,710,605
Notice both answers equal 28,710,605
With that explanation out of the way, let's continue. Next, we take the number 28,710,605 and divide it by 2:
28,710,605 ÷ 2 = 14,355,302.5
If the quotient is a whole number, then 2 and 14,355,302.5 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 | 28,710,605 | |
| -1 | -28,710,605 |
Now, we try dividing 28,710,605 by 3:
28,710,605 ÷ 3 = 9,570,201.6667
If the quotient is a whole number, then 3 and 9,570,201.6667 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 | 28,710,605 | |
| -1 | -28,710,605 |
Let's try dividing by 4:
28,710,605 ÷ 4 = 7,177,651.25
If the quotient is a whole number, then 4 and 7,177,651.25 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 | 28,710,605 | |
| -1 | 28,710,605 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 11 | 35 | 55 | 77 | 385 | 74,573 | 372,865 | 522,011 | 820,303 | 2,610,055 | 4,101,515 | 5,742,121 | 28,710,605 |
| -1 | -5 | -7 | -11 | -35 | -55 | -77 | -385 | -74,573 | -372,865 | -522,011 | -820,303 | -2,610,055 | -4,101,515 | -5,742,121 | -28,710,605 |
Here are some more numbers to try:
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