Alright, let's work through 8683 times 6478 step by step
8683 × 6478 = 6478 × (8683)
+ 6478 × 3 what gives us 19434
+ 6478 × 80 producing 518240
+ 6478 × 600 yielding 3886800
+ 6478 × 8000 which equals 51824000

= 56248474
