Alright, let's work through 1687 times 492 step by step
1687 × 492 = 492 × (1687)
+ 492 × 7 resulting in 3444
+ 492 × 80 that results in 39360
+ 492 × 600 what gives us 295200
+ 492 × 1000 yielding 492000

= 830004
