Alright, let's work through 72847179 times 20109719 step by step
72847179 × 20109719 = 20109719 × (72847179)
+ 20109719 × 9 that is equal 180987471
+ 20109719 × 70 that equals 1407680330
+ 20109719 × 100 producing 2010971900
+ 20109719 × 7000 yielding 140768033000
+ 20109719 × 40000 that results in 804388760000
+ 20109719 × 800000 that results in 16087775200000
+ 20109719 × 2000000 yielding 40219438000000
+ 20109719 × 70000000 that results in 1407680330000000

= 1464936299632701
