Alright, let's work through 12788649 times 77211538 step by step
12788649 × 77211538 = 77211538 × (12788649)
+ 77211538 × 9 which equals 694903842
+ 77211538 × 40 that equals 3088461520
+ 77211538 × 600 yielding 46326922800
+ 77211538 × 8000 resulting in 617692304000
+ 77211538 × 80000 giving us 6176923040000
+ 77211538 × 700000 that is equal 54048076600000
+ 77211538 × 2000000 giving us 154423076000000
+ 77211538 × 10000000 yielding 772115380000000

= 987431258232162
