What is the missing number in the box?~\uline{~~~~~~~~~~}~  $$\square \div7=83 \rm R 4$$ 
Overseas Competition->Knowledge Point->Number Theory Modules->Remainder Problems->Questions involving Divisions with Remainders->Relationship between Dividend, Divisor, Quotient and Remainder in Division
$$83\times7=581$$  $$581+4=585$$ 