The factors of 138 are 1, 2, 3, 6, 23, 46, 69, and 138
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It is: 2
The GCF is 138.
It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
The greatest common factor is three.
The GCF is 46.