Alright, let's work through 80391234 times 36156132 step by step
80391234 × 36156132 = 36156132 × (80391234)
+ 36156132 × 4 resulting in 144624528
+ 36156132 × 30 which equals 1084683960
+ 36156132 × 200 resulting in 7231226400
+ 36156132 × 1000 yielding 36156132000
+ 36156132 × 90000 that results in 3254051880000
+ 36156132 × 300000 that equals 10846839600000
+ 36156132 × 0000000 that results in 0
+ 36156132 × 80000000 yielding 2892490560000000

= 2906636068146888
