Alright, let's work through 80640027 times 73270543 step by step
80640027 × 73270543 = 73270543 × (80640027)
+ 73270543 × 7 that is equal 512893801
+ 73270543 × 20 that results in 1465410860
+ 73270543 × 000 resulting in 0
+ 73270543 × 0000 giving us 0
+ 73270543 × 40000 resulting in 2930821720000
+ 73270543 × 600000 yielding 43962325800000
+ 73270543 × 0000000 yielding 0
+ 73270543 × 80000000 resulting in 5861643440000000

= 5908538565824661
