A:
Positive:
1 x 64466221313 x 4958940161 x 10568233793 x 812941827 x 779519983 x 65581110751 x 5996312779 x 50447
Negative:
-1 x -644662213-13 x -49589401-61 x -10568233-793 x -812941-827 x -779519-983 x -655811-10751 x -59963-12779 x -50447
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 644,662,213, 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 | 644,662,213 | |
| -1 | -644,662,213 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 644,662,213.
Example:
1 x 644,662,213 = 644,662,213
and
-1 x -644,662,213 = 644,662,213
Notice both answers equal 644,662,213
With that explanation out of the way, let's continue. Next, we take the number 644,662,213 and divide it by 2:
644,662,213 ÷ 2 = 322,331,106.5
If the quotient is a whole number, then 2 and 322,331,106.5 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 | 644,662,213 | |
| -1 | -644,662,213 |
Now, we try dividing 644,662,213 by 3:
644,662,213 ÷ 3 = 214,887,404.3333
If the quotient is a whole number, then 3 and 214,887,404.3333 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 | 644,662,213 | |
| -1 | -644,662,213 |
Let's try dividing by 4:
644,662,213 ÷ 4 = 161,165,553.25
If the quotient is a whole number, then 4 and 161,165,553.25 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 | 644,662,213 | |
| -1 | 644,662,213 |
If you did it right, you will end up with this table:
| 1 | 13 | 61 | 793 | 827 | 983 | 10,751 | 12,779 | 50,447 | 59,963 | 655,811 | 779,519 | 812,941 | 10,568,233 | 49,589,401 | 644,662,213 |
| -1 | -13 | -61 | -793 | -827 | -983 | -10,751 | -12,779 | -50,447 | -59,963 | -655,811 | -779,519 | -812,941 | -10,568,233 | -49,589,401 | -644,662,213 |
Here are some more numbers to try:
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