54 (fifty-four ) is the natural number following 53 and preceding 55 .
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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, 33 + 33 = 54, and hence is a Leyland number .[2]
54 is the smallest number that can be written as the sum of three positive squares in more than two different ways: 72 + 22 + 12 = 62 + 32 + 32 = 52 + 52 + 22 = 54.[3] [4]
It is a 19-gonal number ,[5]
In base 10, 54 is a Harshad number .[6]
The Holt graph has 54 edges.
The sine of an angle of 54 degrees is half the golden ratio .
The number of primes ≤ 28 .[7]
A Lehmer-Comtet number.[8]
54 is the only non-trivial Neon Number in Power 9: 549 = 3,904,305,912,313,344; 3 + 9 + 0 + 4 + 3 + 0 + 5 + 9 + 1 + 2 + 3 + 1 + 3 + 3 + 4 + 4 = 54
A Rubik's Cube has 54 colored squares.
Traditional Japanese symbols of the 54 chapters of the Tale of Genji