Alright, let's work through 31117295 times 87127881 step by step
31117295 × 87127881 = 87127881 × (31117295)
+ 87127881 × 5 what gives us 435639405
+ 87127881 × 90 what gives us 7841509290
+ 87127881 × 200 what gives us 17425576200
+ 87127881 × 7000 producing 609895167000
+ 87127881 × 10000 producing 871278810000
+ 87127881 × 100000 resulting in 8712788100000
+ 87127881 × 1000000 which equals 87127881000000
+ 87127881 × 30000000 producing 2613836430000000

= 2711183975801895
