A:
Positive:
1 x 2785443855 x 557088777 x 3979205535 x 7958411643 x 4331953215 x 866394501 x 6188512377 x 22505
Negative:
-1 x -278544385-5 x -55708877-7 x -39792055-35 x -7958411-643 x -433195-3215 x -86639-4501 x -61885-12377 x -22505
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 278,544,385, 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 | 278,544,385 | |
| -1 | -278,544,385 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 278,544,385.
Example:
1 x 278,544,385 = 278,544,385
and
-1 x -278,544,385 = 278,544,385
Notice both answers equal 278,544,385
With that explanation out of the way, let's continue. Next, we take the number 278,544,385 and divide it by 2:
278,544,385 ÷ 2 = 139,272,192.5
If the quotient is a whole number, then 2 and 139,272,192.5 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 | 278,544,385 | |
| -1 | -278,544,385 |
Now, we try dividing 278,544,385 by 3:
278,544,385 ÷ 3 = 92,848,128.3333
If the quotient is a whole number, then 3 and 92,848,128.3333 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 | 278,544,385 | |
| -1 | -278,544,385 |
Let's try dividing by 4:
278,544,385 ÷ 4 = 69,636,096.25
If the quotient is a whole number, then 4 and 69,636,096.25 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 | 278,544,385 | |
| -1 | 278,544,385 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 643 | 3,215 | 4,501 | 12,377 | 22,505 | 61,885 | 86,639 | 433,195 | 7,958,411 | 39,792,055 | 55,708,877 | 278,544,385 |
| -1 | -5 | -7 | -35 | -643 | -3,215 | -4,501 | -12,377 | -22,505 | -61,885 | -86,639 | -433,195 | -7,958,411 | -39,792,055 | -55,708,877 | -278,544,385 |
Here are some more numbers to try:
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