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80 (number)

← 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
Greek numeral	Π´
Roman numeral	LXXX
Greek prefix	heptaconta
Binary	10100002
Ternary	22223
Quaternary	11004
Quinary	3105
Senary	2126
Octal	1208
Duodecimal	6812
Hexadecimal	5016
Vigesimal	4020
Base 36	2836

80 (written as eighty) is an even number between 79 and 81 .

In Mathematics

• It is an abundant number since its sum of divisors (1+ 2+ 4+ 5+ 8 +10 +16+ 20+ 40+ 80) is greater than 160.
• 80 is the largest natural number such that all prime factors of n and n+1 are smaller than 6.
• Eighty is also a harshad number: 80/8+0=10

In Science

Mercury-in-glass thermometer

• In science,the 80th element is mercury, which is often used in laboratories for making thermometers and barometers.

1000

A thousand (1000, one thousand or 1,000) is the natural number after 999 and before 1001. One thousand thousands is known as a million.

In Roman numerals, 1000 is written as M. It is known as 10³ in scientific notation.

Numbers from 1000 to 10000

• 1001

Measurements

• The number of grams in a kilogram

(1000g=1kg)

• The number of millimeters in a meter (1000mm=1m)
• The number of meters in a kilometer

(1000m=1km) In other examples, 1000 is used as year calculating. 1000 years is equal to one millennium.