Alright, let's work through 1639 times 5478 step by step
1639 × 5478 = 5478 × (1639)
+ 5478 × 9 yielding 49302
+ 5478 × 30 that results in 164340
+ 5478 × 600 that equals 3286800
+ 5478 × 1000 producing 5478000

= 8978442
