Milliseconds in a day Posted on 2020/07/17 by Carl Robitaille The fifth hyperfactorial: 5⁵ × 4⁴ × 3³ × 2² × 1¹ = 86400000 milliseconds is exactly 1 day! pic.twitter.com/9ENaHNqsBG— Fermat's Library (@fermatslibrary) May 16, 2018