A:
Positive:
1 x 782157482 x 391078743 x 260719164 x 195539376 x 1303595812 x 651797913 x 601659626 x 300829839 x 200553252 x 150414978 x 1002766156 x 501383
Negative:
-1 x -78215748-2 x -39107874-3 x -26071916-4 x -19553937-6 x -13035958-12 x -6517979-13 x -6016596-26 x -3008298-39 x -2005532-52 x -1504149-78 x -1002766-156 x -501383
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 78,215,748, 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 | 78,215,748 | |
| -1 | -78,215,748 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 78,215,748.
Example:
1 x 78,215,748 = 78,215,748
and
-1 x -78,215,748 = 78,215,748
Notice both answers equal 78,215,748
With that explanation out of the way, let's continue. Next, we take the number 78,215,748 and divide it by 2:
78,215,748 ÷ 2 = 39,107,874
If the quotient is a whole number, then 2 and 39,107,874 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 39,107,874 | 78,215,748 | |
| -1 | -2 | -39,107,874 | -78,215,748 |
Now, we try dividing 78,215,748 by 3:
78,215,748 ÷ 3 = 26,071,916
If the quotient is a whole number, then 3 and 26,071,916 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 3 | 26,071,916 | 39,107,874 | 78,215,748 | |
| -1 | -2 | -3 | -26,071,916 | -39,107,874 | -78,215,748 |
Let's try dividing by 4:
78,215,748 ÷ 4 = 19,553,937
If the quotient is a whole number, then 4 and 19,553,937 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!
Here is what our table should look like at this step:
| 1 | 2 | 3 | 4 | 19,553,937 | 26,071,916 | 39,107,874 | 78,215,748 | |
| -1 | -2 | -3 | -4 | -19,553,937 | -26,071,916 | -39,107,874 | 78,215,748 |
If you did it right, you will end up with this table:
| 1 | 2 | 3 | 4 | 6 | 12 | 13 | 26 | 39 | 52 | 78 | 156 | 501,383 | 1,002,766 | 1,504,149 | 2,005,532 | 3,008,298 | 6,016,596 | 6,517,979 | 13,035,958 | 19,553,937 | 26,071,916 | 39,107,874 | 78,215,748 |
| -1 | -2 | -3 | -4 | -6 | -12 | -13 | -26 | -39 | -52 | -78 | -156 | -501,383 | -1,002,766 | -1,504,149 | -2,005,532 | -3,008,298 | -6,016,596 | -6,517,979 | -13,035,958 | -19,553,937 | -26,071,916 | -39,107,874 | -78,215,748 |
Here are some more numbers to try:
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