Alright, let's work through 71839524 times 81384319 step by step
71839524 × 81384319 = 81384319 × (71839524)
+ 81384319 × 4 giving us 325537276
+ 81384319 × 20 giving us 1627686380
+ 81384319 × 500 that results in 40692159500
+ 81384319 × 9000 yielding 732458871000
+ 81384319 × 30000 yielding 2441529570000
+ 81384319 × 800000 which equals 65107455200000
+ 81384319 × 1000000 what gives us 81384319000000
+ 81384319 × 70000000 what gives us 5696902330000000

= 5846610738024156
