Alright, let's work through 84073214 times 15680487 step by step
84073214 × 15680487 = 15680487 × (84073214)
+ 15680487 × 4 what gives us 62721948
+ 15680487 × 10 that is equal 156804870
+ 15680487 × 200 that equals 3136097400
+ 15680487 × 3000 yielding 47041461000
+ 15680487 × 70000 resulting in 1097634090000
+ 15680487 × 000000 which equals 0
+ 15680487 × 4000000 what gives us 62721948000000
+ 15680487 × 80000000 that results in 1254438960000000

= 1318308939175218
