The factors of 27 are 1,3,9, and 27
The factors of 64 are 1,2,4,8,16,32, and 64.
1 is the only common factor of 27 and 64.
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The common factors of 18 and 64 are 1 and 2.
The common factors of 28 and 64 are: 1, 2, and 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
The common factors of 64 and 72 are 1, 2, 4 and 8.
The common factors of 16 and 64 are 1, 2, 4, 8, and 16