Alright, let's work through 80089934 times 79672393 step by step
80089934 × 79672393 = 79672393 × (80089934)
+ 79672393 × 4 giving us 318689572
+ 79672393 × 30 resulting in 2390171790
+ 79672393 × 900 producing 71705153700
+ 79672393 × 9000 which equals 717051537000
+ 79672393 × 80000 what gives us 6373791440000
+ 79672393 × 000000 that is equal 0
+ 79672393 × 0000000 what gives us 0
+ 79672393 × 80000000 yielding 6373791440000000

= 6380956696992062
