Alright, let's work through 71517099 times 72871738 step by step
71517099 × 72871738 = 72871738 × (71517099)
+ 72871738 × 9 what gives us 655845642
+ 72871738 × 90 that is equal 6558456420
+ 72871738 × 000 giving us 0
+ 72871738 × 7000 what gives us 510102166000
+ 72871738 × 10000 that is equal 728717380000
+ 72871738 × 500000 resulting in 36435869000000
+ 72871738 × 1000000 giving us 72871738000000
+ 72871738 × 70000000 which equals 5101021660000000

= 5211575300848062
