Main Page | See live article | Alphabetical index 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. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.