A:
Positive:
1 x 6214160155 x 12428320311 x 5649236555 x 11298473661 x 9401153305 x 1880237271 x 8546517093 x 36355
Negative:
-1 x -621416015-5 x -124283203-11 x -56492365-55 x -11298473-661 x -940115-3305 x -188023-7271 x -85465-17093 x -36355
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 621,416,015, 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 | 621,416,015 | |
| -1 | -621,416,015 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 621,416,015.
Example:
1 x 621,416,015 = 621,416,015
and
-1 x -621,416,015 = 621,416,015
Notice both answers equal 621,416,015
With that explanation out of the way, let's continue. Next, we take the number 621,416,015 and divide it by 2:
621,416,015 ÷ 2 = 310,708,007.5
If the quotient is a whole number, then 2 and 310,708,007.5 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 | 621,416,015 | |
| -1 | -621,416,015 |
Now, we try dividing 621,416,015 by 3:
621,416,015 ÷ 3 = 207,138,671.6667
If the quotient is a whole number, then 3 and 207,138,671.6667 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 | 621,416,015 | |
| -1 | -621,416,015 |
Let's try dividing by 4:
621,416,015 ÷ 4 = 155,354,003.75
If the quotient is a whole number, then 4 and 155,354,003.75 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 | 621,416,015 | |
| -1 | 621,416,015 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 55 | 661 | 3,305 | 7,271 | 17,093 | 36,355 | 85,465 | 188,023 | 940,115 | 11,298,473 | 56,492,365 | 124,283,203 | 621,416,015 |
| -1 | -5 | -11 | -55 | -661 | -3,305 | -7,271 | -17,093 | -36,355 | -85,465 | -188,023 | -940,115 | -11,298,473 | -56,492,365 | -124,283,203 | -621,416,015 |
Here are some more numbers to try:
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