23
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You could write it as 8^3*7^2. Actually, the "^3" and "^2" should be superscript 3 and 2 but this browser is incapable of such niceties. In terms of prime factorisation, though, it should be written as 2^9*7^2.
-8
It is: 2 to the power of 8 = 256
2 to the 3rd power = 2 * 2 * 2 = 8
2 power 12 is 8192 and 3 power 8 is 6561