Alright, let's work through 3628 times 4365 step by step
3628 × 4365 = 4365 × (3628)
+ 4365 × 8 yielding 34920
+ 4365 × 20 resulting in 87300
+ 4365 × 600 resulting in 2619000
+ 4365 × 3000 that equals 13095000

= 15836220
