Alright, let's work through 6389 times 4067 step by step
6389 × 4067 = 4067 × (6389)
+ 4067 × 9 resulting in 36603
+ 4067 × 80 yielding 325360
+ 4067 × 300 that results in 1220100
+ 4067 × 6000 resulting in 24402000

= 25984063
