Alright, let's work through 84280139 times 50713693 step by step
84280139 × 50713693 = 50713693 × (84280139)
+ 50713693 × 9 that results in 456423237
+ 50713693 × 30 what gives us 1521410790
+ 50713693 × 100 resulting in 5071369300
+ 50713693 × 0000 that results in 0
+ 50713693 × 80000 giving us 4057095440000
+ 50713693 × 200000 that equals 10142738600000
+ 50713693 × 4000000 that results in 202854772000000
+ 50713693 × 80000000 that equals 4057095440000000

= 4274157095243327
