27 and 81
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64 is a multiple of 16, and 81 is a multiple of 27, so I'd say that 36 is the odd one out.
Square numbers 16, 25, 36, 49, 64, 81, 100
It's even
25 is odd
72 is not an odd number because it is divisible by 2. 72/2 = 36.