Alright, let's work through 63848963 times 78276387 step by step
63848963 × 78276387 = 78276387 × (63848963)
+ 78276387 × 3 what gives us 234829161
+ 78276387 × 60 yielding 4696583220
+ 78276387 × 900 yielding 70448748300
+ 78276387 × 8000 giving us 626211096000
+ 78276387 × 40000 yielding 3131055480000
+ 78276387 × 800000 that results in 62621109600000
+ 78276387 × 3000000 producing 234829161000000
+ 78276387 × 60000000 resulting in 4696583220000000

= 4997866137336681
