Alright, let's work through 87884857 times 63946447 step by step
87884857 × 63946447 = 63946447 × (87884857)
+ 63946447 × 7 resulting in 447625129
+ 63946447 × 50 that results in 3197322350
+ 63946447 × 800 which equals 51157157600
+ 63946447 × 4000 that equals 255785788000
+ 63946447 × 80000 which equals 5115715760000
+ 63946447 × 800000 producing 51157157600000
+ 63946447 × 7000000 which equals 447625129000000
+ 63946447 × 80000000 resulting in 5115715760000000

= 5619924350253079
