In Mathematics
54 is a 19-gonal number. Twice the third power of three, 54 is a Leyland number. 54 can be written as the sum of three squares in three different ways: . It is the smallest number with this property. Like all other multiples of 6, it is a semiperfect number.
The factorial of 54 is 230,843,697,339,241,380,472,092,742,683,027,581,083,278,564,571,807,941,132,288,000,000,000,000, or approximately 230.843697339241 x 1069.
In base 10, 54 is a Harshad number.
The Holt graph has 54 edges.
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