Alright, let's work through 81678172 times 9079761 step by step
81678172 × 9079761 = 9079761 × (81678172)
+ 9079761 × 2 producing 18159522
+ 9079761 × 70 producing 635583270
+ 9079761 × 100 that equals 907976100
+ 9079761 × 8000 that equals 72638088000
+ 9079761 × 70000 producing 635583270000
+ 9079761 × 600000 that results in 5447856600000
+ 9079761 × 1000000 resulting in 9079761000000
+ 9079761 × 80000000 giving us 726380880000000

= 741618280676892
