Alright, let's work through 63877814 times 67200143 step by step
63877814 × 67200143 = 67200143 × (63877814)
+ 67200143 × 4 giving us 268800572
+ 67200143 × 10 yielding 672001430
+ 67200143 × 800 producing 53760114400
+ 67200143 × 7000 that equals 470401001000
+ 67200143 × 70000 which equals 4704010010000
+ 67200143 × 800000 giving us 53760114400000
+ 67200143 × 3000000 resulting in 201600429000000
+ 67200143 × 60000000 which equals 4032008580000000

= 4292598235327402
