Alright, let's work through 12987919 times 72377892 step by step
12987919 × 72377892 = 72377892 × (12987919)
+ 72377892 × 9 that equals 651401028
+ 72377892 × 10 yielding 723778920
+ 72377892 × 900 that results in 65140102800
+ 72377892 × 7000 resulting in 506645244000
+ 72377892 × 80000 yielding 5790231360000
+ 72377892 × 900000 resulting in 65140102800000
+ 72377892 × 2000000 that equals 144755784000000
+ 72377892 × 10000000 that equals 723778920000000

= 940038198686748
