54 (fifty-four) is the natural number following 53 and preceding 55. In mathematics. 54 as the sum of three positive squares. 54 is an abundant number and a semiperfect number, like all other multiples of 6. [1] It is twice the third power of three, 3 3 + 3 3 = 54, and hence is a Leyland number. [2] More @Wikipedia
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