Hecho general: 90722 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Hecho matemático: 90722 is a boring number.
Trivia: 90722 is a boring number.
Fecha histórica: May 21st is the day in 1946 that Physicist Louis Slotin is fatally irradiated in a criticality incident during an experiment with the Demon core at Los Alamos National Laboratory.