Alright, let's work through 81920004 times 42392819 step by step
81920004 × 42392819 = 42392819 × (81920004)
+ 42392819 × 4 yielding 169571276
+ 42392819 × 00 producing 0
+ 42392819 × 000 that equals 0
+ 42392819 × 0000 what gives us 0
+ 42392819 × 20000 that is equal 847856380000
+ 42392819 × 900000 that equals 38153537100000
+ 42392819 × 1000000 yielding 42392819000000
+ 42392819 × 80000000 which equals 3391425520000000

= 3472819902051276
