There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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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.
The greatest common factor of 36, 60, and 96 is 12
The greatest common factor of 96 and 120 is 24.
The greatest common factor (GCF) of 96 and 100 is 4.
The greatest common factor of 66 and 96 is 6.
The Greatest Common Factor is 6