A:
Positive:
1 x 1657899111 x 150718113 x 1275307143 x 115937191 x 86801607 x 273132101 x 78912483 x 6677
Negative:
-1 x -16578991-11 x -1507181-13 x -1275307-143 x -115937-191 x -86801-607 x -27313-2101 x -7891-2483 x -6677
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 16,578,991, 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 | 16,578,991 | |
| -1 | -16,578,991 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 16,578,991.
Example:
1 x 16,578,991 = 16,578,991
and
-1 x -16,578,991 = 16,578,991
Notice both answers equal 16,578,991
With that explanation out of the way, let's continue. Next, we take the number 16,578,991 and divide it by 2:
16,578,991 ÷ 2 = 8,289,495.5
If the quotient is a whole number, then 2 and 8,289,495.5 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 | 16,578,991 | |
| -1 | -16,578,991 |
Now, we try dividing 16,578,991 by 3:
16,578,991 ÷ 3 = 5,526,330.3333
If the quotient is a whole number, then 3 and 5,526,330.3333 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 | 16,578,991 | |
| -1 | -16,578,991 |
Let's try dividing by 4:
16,578,991 ÷ 4 = 4,144,747.75
If the quotient is a whole number, then 4 and 4,144,747.75 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 | 16,578,991 | |
| -1 | 16,578,991 |
If you did it right, you will end up with this table:
| 1 | 11 | 13 | 143 | 191 | 607 | 2,101 | 2,483 | 6,677 | 7,891 | 27,313 | 86,801 | 115,937 | 1,275,307 | 1,507,181 | 16,578,991 |
| -1 | -11 | -13 | -143 | -191 | -607 | -2,101 | -2,483 | -6,677 | -7,891 | -27,313 | -86,801 | -115,937 | -1,275,307 | -1,507,181 | -16,578,991 |
Here are some more numbers to try:
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