The Number 84Prime Factors of 84=2x2x3x7.
84 is a 29-gonal Number.
84 is a Tetrahedral Number.
84 is an Abundant Number.
"The number 84 is a "whole" or "perfect" number. Thus the eighty-four siddhas can be seen as archetypes representing the thousands of exemplars and adepts of the tantric way."
The Year 84 ADIn the year 84 AD: change of Jianchu era to Yuanhe era of the Chinese Eastern Han Dynasty.
In the year 84 AD an envoy from the Kushans asking for marriage to a Han Chinese princess was refused.
In the year 84 AD The Celtic tribes united under the leader Calgacus( The Swordsman), and were defeated by the Romans at the battle of Mons Graupius.