Alright, let's work through 8445 times 5647 step by step
8445 × 5647 = 5647 × (8445)
+ 5647 × 5 yielding 28235
+ 5647 × 40 what gives us 225880
+ 5647 × 400 what gives us 2258800
+ 5647 × 8000 producing 45176000

= 47688915
