Alright, let's work through 8151839 times 77479828 step by step
8151839 × 77479828 = 77479828 × (8151839)
+ 77479828 × 9 that equals 697318452
+ 77479828 × 30 that equals 2324394840
+ 77479828 × 800 yielding 61983862400
+ 77479828 × 1000 producing 77479828000
+ 77479828 × 50000 what gives us 3873991400000
+ 77479828 × 100000 that results in 7747982800000
+ 77479828 × 8000000 giving us 619838624000000

= 631603083603692
