You can't name the greatest common factor of a single number. You need at lest two numbers to find a GCF.
In order to have a GCF there must be two or more numbers.
The factors of 64 are 1, 2, 4, 8, 16, 32, 64.
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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.