Fatto matematico: 4558 is a member of the Fibonacci-type sequence starting with 1 and 4.
Trivia: 4558 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: June 23rd is the day in 1969 that Warren E. Burger is sworn in as Chief Justice of the United States Supreme Court by retiring Chief Justice Earl Warren.