A:
Positive:
1 x 664206213 x 221402079 x 738006927 x 24600231181 x 562412083 x 318873543 x 187476249 x 10629
Negative:
-1 x -66420621-3 x -22140207-9 x -7380069-27 x -2460023-1181 x -56241-2083 x -31887-3543 x -18747-6249 x -10629
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 66,420,621, 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 | 66,420,621 | |
| -1 | -66,420,621 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 66,420,621.
Example:
1 x 66,420,621 = 66,420,621
and
-1 x -66,420,621 = 66,420,621
Notice both answers equal 66,420,621
With that explanation out of the way, let's continue. Next, we take the number 66,420,621 and divide it by 2:
66,420,621 ÷ 2 = 33,210,310.5
If the quotient is a whole number, then 2 and 33,210,310.5 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 | 66,420,621 | |
| -1 | -66,420,621 |
Now, we try dividing 66,420,621 by 3:
66,420,621 ÷ 3 = 22,140,207
If the quotient is a whole number, then 3 and 22,140,207 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 | 3 | 22,140,207 | 66,420,621 | |
| -1 | -3 | -22,140,207 | -66,420,621 |
Let's try dividing by 4:
66,420,621 ÷ 4 = 16,605,155.25
If the quotient is a whole number, then 4 and 16,605,155.25 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 | 3 | 22,140,207 | 66,420,621 | |
| -1 | -3 | -22,140,207 | 66,420,621 |
If you did it right, you will end up with this table:
| 1 | 3 | 9 | 27 | 1,181 | 2,083 | 3,543 | 6,249 | 10,629 | 18,747 | 31,887 | 56,241 | 2,460,023 | 7,380,069 | 22,140,207 | 66,420,621 |
| -1 | -3 | -9 | -27 | -1,181 | -2,083 | -3,543 | -6,249 | -10,629 | -18,747 | -31,887 | -56,241 | -2,460,023 | -7,380,069 | -22,140,207 | -66,420,621 |
Here are some more numbers to try:
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