Alright, let's work through 80401429 times 48999844 step by step
80401429 × 48999844 = 48999844 × (80401429)
+ 48999844 × 9 yielding 440998596
+ 48999844 × 20 that is equal 979996880
+ 48999844 × 400 what gives us 19599937600
+ 48999844 × 1000 giving us 48999844000
+ 48999844 × 00000 producing 0
+ 48999844 × 400000 yielding 19599937600000
+ 48999844 × 0000000 resulting in 0
+ 48999844 × 80000000 what gives us 3919987520000000

= 3939657478377076
