Alright, let's work through 8640 times 2040 step by step
8640 × 2040 = 2040 × (8640)
+ 2040 × 0 that results in 0
+ 2040 × 40 what gives us 81600
+ 2040 × 600 that results in 1224000
+ 2040 × 8000 producing 16320000

= 17625600
