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1, 639

Then by inspection of the number 639 , we note that each number is a multiple of '3' . So '3' is a factor.

Also , slightly more 'tricky'. If we add the digits of 639 ; 6 + 3 + 9 = 18

1 + 8 = 9 . This means that the number has '9' is a factor. NB This only applies to factors/multiples of '9'

Finally, divide 639 by 71 and/or 213 . If you have a whole number answer (No decimals), then those numbers are also factors of 639.

Hence 639/71 = 9 & 329 / 213 = 3

So allthe given numbers are factors of 639.

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Q: What are the factors of 639?

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As a product of its prime factors: 3*3*71 = 639 or as 32*71 = 639

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639 is a composite number. Its positive integer factors are: 1, 3, 9, 71, 213, 639

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1, 3, 9, 71, 213, 639.