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 factor of any number is itself.
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Eight
The greatest common factor of 28 and 72 is 4.
The GCF is 8.
The greatest common factor of 12, 18, 20 and 32 is 2.
The GCF is 8.