Alright, let's work through 80378185 times 90197267 step by step
80378185 × 90197267 = 90197267 × (80378185)
+ 90197267 × 5 yielding 450986335
+ 90197267 × 80 resulting in 7215781360
+ 90197267 × 100 which equals 9019726700
+ 90197267 × 8000 that results in 721578136000
+ 90197267 × 70000 that is equal 6313808690000
+ 90197267 × 300000 that results in 27059180100000
+ 90197267 × 0000000 that is equal 0
+ 90197267 × 80000000 which equals 7215781360000000

= 7249892613420395
