No problem, we've got 6420 and 5856 to multiply
6420 × 5856 = 5856 × (6420)
+ 5856 × 0 what gives us 0
+ 5856 × 20 which equals 117120
+ 5856 × 400 which equals 2342400
+ 5856 × 6000 which equals 35136000

= 37595520
