Alright, let's work through 6720 times 5553 step by step
6720 × 5553 = 5553 × (6720)
+ 5553 × 0 giving us 0
+ 5553 × 20 what gives us 111060
+ 5553 × 700 which equals 3887100
+ 5553 × 6000 yielding 33318000

= 37316160
