Fatto generale: 70573 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 70573 is an unremarkable number.
Trivia: 70573 is a boring number.
Data storica: March 21st is the day in 1965 that Martin Luther King, Jr. leads 3,200 people on the start of the third and finally successful civil rights march from Selma to Montgomery, Alabama.