None. By definition a three digit number is greater than 99, whereas 64 is smaller. 064 is NOT a three-digit number.
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The answer is 64 4^3 = 64 8^2 = 64
64. 64 = 82 = 43 26 = (23)2 = (22)3 = 64.
4 options for the first digit, 3 options for the second digit, 2 options for the third digit. Multiply the number of options together, and you find how many 3-digit numbers you can get.
121
Let the first and third digits be equal. Choose any other number as the second digit. 202, 919, etc.