Rockin' Jon, a music club owner, is planning for the next annual Rockin' Jon's New Year's Eve Jamfest. He has noticed that when he charges more for tickets for the show, fewer people buy tickets. Rockin' Jon's total revenue from selling tickets for the Jamfest, in dollars, can be modeled by the expression p(576–16p), where p is the price per ticket in dollars. This expression can be written in factored form as – 16p(p–36). What does the number 36 represent in the expression?