No problem, we've got 7989 and 807 to multiply
7989 × 807 = 807 × (7989)
+ 807 × 9 producing 7263
+ 807 × 80 what gives us 64560
+ 807 × 900 resulting in 726300
+ 807 × 7000 what gives us 5649000

= 6447123
