There is not a number that has a greatest common factor of 6.
There is not a greatest common factor of a single number. There cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common.
So, there can be a set of numbers that has a greatest common factor of 6 but not a single number. Here are some of those sets:
GCF (6, 24) = 6
GCF (12, 30) = 6
GCF (48, 54) = 6
GCF (24, 48, 90) = 6
GCF (54, 66, 78) = 6
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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 is 6
The GCF is 6.
The greatest common factor of 42 and 66 is 6.6
The greatest common factor of 6 and 36 is 6. Since 6 is a factor of 36, it is automatically the GCF.