Alright, let's work through 90904880 times 80488390 step by step
90904880 × 80488390 = 80488390 × (90904880)
+ 80488390 × 0 that is equal 0
+ 80488390 × 80 that is equal 6439071200
+ 80488390 × 800 giving us 64390712000
+ 80488390 × 4000 what gives us 321953560000
+ 80488390 × 00000 yielding 0
+ 80488390 × 900000 resulting in 72439551000000
+ 80488390 × 0000000 giving us 0
+ 80488390 × 90000000 yielding 7243955100000000

= 7316787434343200
