Answer :

skyhi
The answer is 8 because 8*8=64
Since, 8 * 8 = 64,

The factor pair of 64 is 8.

Or, 
2|64
2|32
2|16
2|8
2|4
2|2
  1 

64 = 2 * 2 * 2 * 2 * 2 * 2

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