Alright, let's work through 80642912 times 90363557 step by step
80642912 × 90363557 = 90363557 × (80642912)
+ 90363557 × 2 that equals 180727114
+ 90363557 × 10 which equals 903635570
+ 90363557 × 900 that is equal 81327201300
+ 90363557 × 2000 giving us 180727114000
+ 90363557 × 40000 what gives us 3614542280000
+ 90363557 × 600000 that equals 54218134200000
+ 90363557 × 0000000 producing 0
+ 90363557 × 80000000 resulting in 7229084560000000

= 7287180375157984
