Fatto matematico: 7158 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Trivia: 7158 is an uninteresting number.
Data storica: August 6th is the day in 1986 that a low-pressure system that redeveloped off the New South Wales coast dumps a record 328 millimeters (13 inches) of rain in a day on Sydney.