The only common factor of 27 and 64 is one.
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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 (GCF) of 64 and 128 is: 64
The greatest common factor of 4 and 64 is 4.
The greatest common factor of 4, 25, and 64 is 1
The greatest common factor of 40, 64, and 16 is 8.
The GCF of 30 and 64 is 2. The factors of 30 are 1,2,3,10,15, and 30. The factors of 64 are 1,2,4,8,16,32, and 64. The greatest common factor of 30 and 64 is 2.