Alright, let's work through 6407 times 8684 step by step
6407 × 8684 = 8684 × (6407)
+ 8684 × 7 that results in 60788
+ 8684 × 00 yielding 0
+ 8684 × 400 what gives us 3473600
+ 8684 × 6000 that equals 52104000

= 55638388
