All numbers can be factors.
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2 is the only number is that both a factor of 2 and a multiple of 2.
because 70 is an even number, and every even number has 2 as a factor.
2
1 is the least common factor of the number 2, number 4 and number 7. 28 is the least common multiple of the number 2, number 4 and 7.
2