It is the number itself.
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No, for 0 to be a factor, the numbers would have to be divisible by 0. You can't divide any number by 0, so it can't be a factor.1 is a factor of every positive number.
It is. 1 is a factor of every whole number.
It is 1
1
because 70 is an even number, and every even number has 2 as a factor.