How many seconds are in a 24 hour day?

How many seconds are in a 24 hour day?

                                  Well there are <mathjax>%60%</mathjax> seconds in a minute and <mathjax>%60%</mathjax> minutes in an hour and <mathjax>%24%</mathjax> hours in a day.  Thus:<mathjax>%60*60*24=86,400%</mathjax> seconds in a day