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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The GCF is 1.
The greatest common factor (GCF) of 635 and 1000 is 5.
Most Common Factor, Greatest Common Factor, Highest Common Factor... all the same thing.
There is no "common factor" of 350, to have a common factor you must have more than one number, so there is no common factor of 350.
2 is a common factor.