Alright, let's work through 80058036 times 42391854 step by step
80058036 × 42391854 = 42391854 × (80058036)
+ 42391854 × 6 what gives us 254351124
+ 42391854 × 30 that is equal 1271755620
+ 42391854 × 000 giving us 0
+ 42391854 × 8000 that equals 339134832000
+ 42391854 × 50000 yielding 2119592700000
+ 42391854 × 000000 that equals 0
+ 42391854 × 0000000 resulting in 0
+ 42391854 × 80000000 that is equal 3391348320000000

= 3393808573638744
