No problem, we've got 6419 and 8539 to multiply
6419 × 8539 = 8539 × (6419)
+ 8539 × 9 which equals 76851
+ 8539 × 10 what gives us 85390
+ 8539 × 400 giving us 3415600
+ 8539 × 6000 giving us 51234000

= 54811841
