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# 54 (number)

 ← 53 54 55 →
Cardinalfifty-four
Ordinal54th
(fifty-fourth)
Factorization2 × 33
Divisors1, 2, 3, 6, 9, 18, 27, 54
Greek numeralΝΔ´
Roman numeralLIV
Binary1101102
Ternary20003
Quaternary3124
Quinary2045
Senary1306
Octal668
Duodecimal4612
Vigesimal2E20
Base 361I36

54 (fifty-four) is the natural number following 53 and preceding 55.

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## In mathematics

54 is a 19-gonal number.[1] Twice the third power of three, 54 is a Leyland number.[2] 54 can be written as the sum of three squares in three different ways: 72 + 22 + 12 = 62 + 32 + 32 = 52 + 52 + 22 = 54. It is the smallest number with this property. Like all other multiples of 6, it is a semiperfect number.[3]

In base 10, 54 is a Harshad number.[4]

The Holt graph has 54 edges.

The sine of an angle of 54 degrees is half the golden ratio.

## In sports

A Rubik's Cube has 54 colored squares
Traditional Japanese symbols of the 54 chapters of the Tale of Genji

54 is also:

## References

1. ^ "Sloane's A051871 : 19-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
2. ^ "Sloane's A076980 : Leyland numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
3. ^ "Sloane's A005835 : Pseudoperfect (or semiperfect) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
4. ^ "Sloane's A005349 : Niven (or Harshad) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.