28 x 28 = 784
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12 to the second power is 144...2 to the second power is 4, any # to the second power is the # times itself.
18^28 = 140,485,060,518,220,186,283,313,934,500,888,576
28
2^28 = 268,435,456
The exponent is 2 - from the SECOND power.