Eighty-four

Eighty-four (84, LXXXIV) is the natural number following eighty-three and preceeding eighty-five. It's the sum of the first seven triangular numbers, as well as the sum of a twin prime (41 + 43).

• Hexadecimal: 54
• Binary: 01010100
• Factors: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.
• Factorization:
• Ordinal number: eighty-fourth

84 is also

• the atomic number of polonium (Po)
• the model number of AGM-84 Harpoon
• WGS 84
• the house number of 84 Avenue Foch
• the number of the French department Vaucluse
• the designation of Interstate 84, a freeway that runs from Oregon to Utah and from Pennsylvania to Massachusetts.
• the code for international direct dial phone calls to Vietnam
• a town in Pennsylvania: Eighty Four
• the year AD 84 or AD 1984.