Alright, let's work through 5687 times 5490 step by step
5687 × 5490 = 5490 × (5687)
+ 5490 × 7 that results in 38430
+ 5490 × 80 that results in 439200
+ 5490 × 600 resulting in 3294000
+ 5490 × 5000 giving us 27450000

= 31221630
