Alright, let's work through 71895872 times 20712485 step by step
71895872 × 20712485 = 20712485 × (71895872)
+ 20712485 × 2 that is equal 41424970
+ 20712485 × 70 that equals 1449873950
+ 20712485 × 800 that equals 16569988000
+ 20712485 × 5000 producing 103562425000
+ 20712485 × 90000 resulting in 1864123650000
+ 20712485 × 800000 producing 16569988000000
+ 20712485 × 1000000 giving us 20712485000000
+ 20712485 × 70000000 what gives us 1449873950000000

= 1489142170361920
