Alright, let's work through 87907384 times 42016390 step by step
87907384 × 42016390 = 42016390 × (87907384)
+ 42016390 × 4 which equals 168065560
+ 42016390 × 80 what gives us 3361311200
+ 42016390 × 300 yielding 12604917000
+ 42016390 × 7000 which equals 294114730000
+ 42016390 × 00000 that results in 0
+ 42016390 × 900000 which equals 37814751000000
+ 42016390 × 7000000 that results in 294114730000000
+ 42016390 × 80000000 which equals 3361311200000000

= 3693550930023760
