Alright, let's work through 81701908 times 71240696 step by step
81701908 × 71240696 = 71240696 × (81701908)
+ 71240696 × 8 that equals 569925568
+ 71240696 × 00 producing 0
+ 71240696 × 900 what gives us 64116626400
+ 71240696 × 1000 producing 71240696000
+ 71240696 × 00000 yielding 0
+ 71240696 × 700000 yielding 49868487200000
+ 71240696 × 1000000 resulting in 71240696000000
+ 71240696 × 80000000 what gives us 5699255680000000

= 5820500790447968
