54

54 (fifty-four) is the natural number following 53 and preceding 55. In mathematics 54 is an abundant number and a semiperfect number, like all other multiples of 6. It is twice the third power of three, 3 + 3 = 54, and hence is a Leyland number. 54 is the smallest number that can be written as the sum of three positive squares in more than two different ways: = = = 54. It is a 19-gonal number, In base 10, 54 is a Harshad number. The Holt graph has 54 edges. The sine of an angle of 54 degrees is half the golden ratio. The number of primes ≤ 28. A Lehmer-Comtet number. 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 In science The atomic number of xenon is 54.