Alright, let's work through 63987329 times 45011853 step by step
63987329 × 45011853 = 45011853 × (63987329)
+ 45011853 × 9 what gives us 405106677
+ 45011853 × 20 yielding 900237060
+ 45011853 × 300 resulting in 13503555900
+ 45011853 × 7000 yielding 315082971000
+ 45011853 × 80000 that results in 3600948240000
+ 45011853 × 900000 yielding 40510667700000
+ 45011853 × 3000000 which equals 135035559000000
+ 45011853 × 60000000 producing 2700711180000000

= 2880188246810637
