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!
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It is: 3
The greatest common factor of 15 and 18 is three.
48 and 84's highest common factor is 12.
The greatest common factor of the numbers 32 and 22 is 2.
1