Alright, let's work through 71402871 times 50623655 step by step
71402871 × 50623655 = 50623655 × (71402871)
+ 50623655 × 1 what gives us 50623655
+ 50623655 × 70 resulting in 3543655850
+ 50623655 × 800 resulting in 40498924000
+ 50623655 × 2000 resulting in 101247310000
+ 50623655 × 00000 that equals 0
+ 50623655 × 400000 giving us 20249462000000
+ 50623655 × 1000000 giving us 50623655000000
+ 50623655 × 70000000 which equals 3543655850000000

= 3614674307513505
