Alright, let's work through 12698990 times 6397328 step by step
12698990 × 6397328 = 6397328 × (12698990)
+ 6397328 × 0 resulting in 0
+ 6397328 × 90 producing 575759520
+ 6397328 × 900 producing 5757595200
+ 6397328 × 8000 yielding 51178624000
+ 6397328 × 90000 that equals 575759520000
+ 6397328 × 600000 producing 3838396800000
+ 6397328 × 2000000 that is equal 12794656000000
+ 6397328 × 10000000 yielding 63973280000000

= 81239604298720
