A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one, which is 479.
Also, only one number can be the greatest.
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The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. A single number (the smallest) cannot have a GCF.
The GCF is 2.
The GCF is 44.
The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest common factor of 30 and 39 is 3.