Alright, let's work through 87188394 times 45474091 step by step
87188394 × 45474091 = 45474091 × (87188394)
+ 45474091 × 4 resulting in 181896364
+ 45474091 × 90 which equals 4092668190
+ 45474091 × 300 yielding 13642227300
+ 45474091 × 8000 that results in 363792728000
+ 45474091 × 80000 giving us 3637927280000
+ 45474091 × 100000 that results in 4547409100000
+ 45474091 × 7000000 producing 318318637000000
+ 45474091 × 80000000 that results in 3637927280000000

= 3964812962899854
