Alright, let's work through 5487 times 3641 step by step
5487 × 3641 = 3641 × (5487)
+ 3641 × 7 yielding 25487
+ 3641 × 80 resulting in 291280
+ 3641 × 400 which equals 1456400
+ 3641 × 5000 that is equal 18205000

= 19978167
