Alright, let's work through 2087990 times 80381620 step by step
2087990 × 80381620 = 80381620 × (2087990)
+ 80381620 × 0 yielding 0
+ 80381620 × 90 what gives us 7234345800
+ 80381620 × 900 what gives us 72343458000
+ 80381620 × 7000 that equals 562671340000
+ 80381620 × 80000 resulting in 6430529600000
+ 80381620 × 000000 which equals 0
+ 80381620 × 2000000 that equals 160763240000000

= 167836018743800
