Alright, let's work through 71509223 times 63967402 step by step
71509223 × 63967402 = 63967402 × (71509223)
+ 63967402 × 3 producing 191902206
+ 63967402 × 20 that is equal 1279348040
+ 63967402 × 200 that equals 12793480400
+ 63967402 × 9000 giving us 575706618000
+ 63967402 × 00000 which equals 0
+ 63967402 × 500000 what gives us 31983701000000
+ 63967402 × 1000000 that equals 63967402000000
+ 63967402 × 70000000 producing 4477718140000000

= 4574259214348646
