Alright, let's work through 83878887 times 47542806 step by step
83878887 × 47542806 = 47542806 × (83878887)
+ 47542806 × 7 that equals 332799642
+ 47542806 × 80 producing 3803424480
+ 47542806 × 800 which equals 38034244800
+ 47542806 × 8000 that results in 380342448000
+ 47542806 × 70000 giving us 3327996420000
+ 47542806 × 800000 which equals 38034244800000
+ 47542806 × 3000000 that results in 142628418000000
+ 47542806 × 80000000 which equals 3803424480000000

= 3987837652136922
