84 (Number)

84 (eighty-four) is the natural number following 83 and preceding 85.
Cardinaleighty-four
Ordinal84th (eighty-fourth)
Factorization 2^2 \cdot 3 \cdot 7
Divisors 2, 3, 4, 6, 7, 12,
14, 21, 28, 42
Roman numeralLXXXIV
Binary01010100
Hexadecimal54

In mathematics

Eighty-four is the sum of the first seven triangular numbers (making it a tetrahedral number), as well as the sum of a twin prime (41 + 43).

In science

In astronomy,

In other fields

Eighty-four is also:

 

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