Alright, let's work through 6687 times 5890 step by step
6687 × 5890 = 5890 × (6687)
+ 5890 × 7 that equals 41230
+ 5890 × 80 giving us 471200
+ 5890 × 600 yielding 3534000
+ 5890 × 6000 producing 35340000

= 39386430
