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They are all multiples.
The product of all the common prime factors is the GCF. The product of all common factors would vary according to the list.
There cannot be a greatest common factor if there are not at least two numbers to compare. The greatest common factor is the largest factor that all the numbers have in common - the largest factor that they all share.
GCD: 27 LCM: 162 All common factors of 81 and 54 are all multiples of their LCM.