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    * Eighty *

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    (Wikipedia) - 80 (number)   (Redirected from Eighty)
    ← 79 80 81 →
    ← 80 81 82 83 84 85 86 87 88 89 → List of numbers — Integers ← 0 10 20 30 40 50 60 70 80 90 → Cardinal eighty Ordinal 80th (eightieth) Factorization 24× 5 Divisors 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 Roman numeral LXXX Binary 10100002 Ternary 22223 Quaternary 11004 Quinary 3105 Senary 2126 Octal 1208 Duodecimal 6812 Hexadecimal 5016 Vigesimal 4020 Base 36 2836 Hebrew פ (Peh)

    80 (eighty) is the natural number following 79 and preceding 81.

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    In mathematics

    The sum of Euler''s totient function φ(x) over the first sixteen integers is 80.

    Adding up some subsets of its divisors (e.g., 1, 4, 5, 10, 20 and 40) gives 80, hence 80 is a semiperfect number.

    80 is a ménage number, and is a Harshad number in base 10.

    The Pareto principle (also known as the 80-20 rule) states that, for many events, roughly 80% of the effects come from 20% of the causes.

    In scienceElement 80: Mercury (Hg) In religion In sports

    Jerry Rice wore the number 80 for the majority of his NFL career. The number 80 is also the retired number of Seattle Seahawks wide receiver Steve Largent; when Rice was traded to the Seahawks, Largent gave the team permission to unretire his number so Rice could wear it.

    In other fields

    Eighty is also:

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