82 = 64
To be read as "Eight squared equals sixty-four".
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In infinitely many ways. However, if you want powers of positive integers only, then you can express 64 as a power of 2, 4, 8 and of 64 itself.
8 * 8 = 64
64.
66
8 to the power of 1/2 = 2.8284271247461900976033774484194 2.8284271247461900976033774484194 to the power of 2 = 8