A:
Positive:
1 x 280978817 x 401398323 x 122164761 x 460621161 x 174521427 x 658031403 x 200272861 x 9821
Negative:
-1 x -28097881-7 x -4013983-23 x -1221647-61 x -460621-161 x -174521-427 x -65803-1403 x -20027-2861 x -9821
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 28,097,881, 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 | 28,097,881 | |
| -1 | -28,097,881 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 28,097,881.
Example:
1 x 28,097,881 = 28,097,881
and
-1 x -28,097,881 = 28,097,881
Notice both answers equal 28,097,881
With that explanation out of the way, let's continue. Next, we take the number 28,097,881 and divide it by 2:
28,097,881 ÷ 2 = 14,048,940.5
If the quotient is a whole number, then 2 and 14,048,940.5 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 | 28,097,881 | |
| -1 | -28,097,881 |
Now, we try dividing 28,097,881 by 3:
28,097,881 ÷ 3 = 9,365,960.3333
If the quotient is a whole number, then 3 and 9,365,960.3333 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 | 28,097,881 | |
| -1 | -28,097,881 |
Let's try dividing by 4:
28,097,881 ÷ 4 = 7,024,470.25
If the quotient is a whole number, then 4 and 7,024,470.25 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 | 28,097,881 | |
| -1 | 28,097,881 |
If you did it right, you will end up with this table:
| 1 | 7 | 23 | 61 | 161 | 427 | 1,403 | 2,861 | 9,821 | 20,027 | 65,803 | 174,521 | 460,621 | 1,221,647 | 4,013,983 | 28,097,881 |
| -1 | -7 | -23 | -61 | -161 | -427 | -1,403 | -2,861 | -9,821 | -20,027 | -65,803 | -174,521 | -460,621 | -1,221,647 | -4,013,983 | -28,097,881 |
Here are some more numbers to try:
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