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80

 
Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: the cardinal number that is the product of ten and eight
  Synonyms: eighty, LXXX, fourscore


The adjective 80 has one meaning:

Meaning #1: being ten more than seventy
  Synonyms: eighty, lxxx, fourscore


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

80

0 10 20 30 40 50 60 70 80 90

Cardinal eighty
Ordinal 80th
(eightieth)
Numeral system 80
Factorization 2^4 \cdot 5
Divisors 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Roman numeral LXXX
Binary 10100002
Octal 1208
Duodecimal 6812
Hexadecimal 5016

Contents

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 number in base 10.

In astronomy

In other fields

Element 80: Mercury (Hg)

Eighty is also:

See also


External links


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WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "80 (number)" Read more