it is like a factor
ex: 40 and 48 8 is the answer because 6x8=48 and 8x5=40
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28 = 256
17 is a Prime Number, because 1 and 17 are the only Least Common Multiples.
Prime factorizations are unique. No other number will have exactly the same number of prime factors as 28. Multiples of 14 will have some of the same factors.
2 and 5 are the prime factors that are common to all multiples of 10.
If the prime factorizations have no prime factors in common, the numbers are relatively prime.