Just the number 1.
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64, 128, 192, 256, 320, 384, 448 +64 . . .
Yes, 2 is a factor of 64. The reason behind this is that 64 is divisible by 2. Numbers which go into 64 are its factors and 2 is one of the factors.
They are: 1, 2, 4, 8, 16, 32, 64, 128, 256.
The greatest common factor of the numbers 89 and 64 is 1.
The GCF of these numbers 8