The greatest common factor of 4 and 64 is 4.
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The greatest common factor of 4, 25, and 64 is 1
The greatest common factor (GCF) of 20, 48, and 64 is 4.
As an example the factors of 64 are 1, 2, 4, 8, 16, 32, and 64. Examples: The common factors of 9 and 64 are only 1; the greatest common factor is 1. The common factors of 48 and 64 are 1, 2, 4, 8, and 16; the greatest common factor is 16. The common factors of 64 and 100 are 1, 2, and 4; the greatest common factor is 4. Note that for common factors you need two or more numbers
4
The GCF of 64, 84, and 120 is 4.