81 is the only such factor.
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8.653497
To find the number that, when multiplied by itself three times, equals 648, you need to find the cube root of 648. The cube root of 648 is 9, because 9 x 9 x 9 equals 729, which is the closest perfect cube to 648. Therefore, the number you are looking for is 9.
a fourth root of 0.04
The fourth root of 36 = ± 2.44949
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