A:
Positive:
1 x 281459155 x 56291837 x 402084535 x 80416953 x 531055265 x 106211371 x 758651855 x 15173
Negative:
-1 x -28145915-5 x -5629183-7 x -4020845-35 x -804169-53 x -531055-265 x -106211-371 x -75865-1855 x -15173
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 28,145,915, 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 | 28,145,915 | |
| -1 | -28,145,915 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 28,145,915.
Example:
1 x 28,145,915 = 28,145,915
and
-1 x -28,145,915 = 28,145,915
Notice both answers equal 28,145,915
With that explanation out of the way, let's continue. Next, we take the number 28,145,915 and divide it by 2:
28,145,915 ÷ 2 = 14,072,957.5
If the quotient is a whole number, then 2 and 14,072,957.5 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 | 28,145,915 | |
| -1 | -28,145,915 |
Now, we try dividing 28,145,915 by 3:
28,145,915 ÷ 3 = 9,381,971.6667
If the quotient is a whole number, then 3 and 9,381,971.6667 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 | 28,145,915 | |
| -1 | -28,145,915 |
Let's try dividing by 4:
28,145,915 ÷ 4 = 7,036,478.75
If the quotient is a whole number, then 4 and 7,036,478.75 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 | 28,145,915 | |
| -1 | 28,145,915 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 53 | 265 | 371 | 1,855 | 15,173 | 75,865 | 106,211 | 531,055 | 804,169 | 4,020,845 | 5,629,183 | 28,145,915 |
| -1 | -5 | -7 | -35 | -53 | -265 | -371 | -1,855 | -15,173 | -75,865 | -106,211 | -531,055 | -804,169 | -4,020,845 | -5,629,183 | -28,145,915 |
Here are some more numbers to try:
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