No problem, we've got 6419 and 1820 to multiply
6419 × 1820 = 1820 × (6419)
+ 1820 × 9 what gives us 16380
+ 1820 × 10 which equals 18200
+ 1820 × 400 yielding 728000
+ 1820 × 6000 that results in 10920000

= 11682580
