Alright, let's work through 71243603 times 73162673 step by step
71243603 × 73162673 = 73162673 × (71243603)
+ 73162673 × 3 what gives us 219488019
+ 73162673 × 00 resulting in 0
+ 73162673 × 600 giving us 43897603800
+ 73162673 × 3000 giving us 219488019000
+ 73162673 × 40000 what gives us 2926506920000
+ 73162673 × 200000 giving us 14632534600000
+ 73162673 × 1000000 giving us 73162673000000
+ 73162673 × 70000000 that results in 5121387110000000

= 5212372429630819
