What is the code for Sunday ?

If .. Then .. ????
Monday = 617
Tuesday = 729
Wednesday = 9312
Thursday = 8412
Friday = 6511
Saturday = 8614
Sunday = ????
Click here for Answer
Code for Sunday is 6713Logic :
6 - No. of Letters in Sunday
7 - 7th day of the week starting monday
13 - 6+7 is 13.