Alright, let's work through 12735072 times 80864542 step by step
12735072 × 80864542 = 80864542 × (12735072)
+ 80864542 × 2 resulting in 161729084
+ 80864542 × 70 that equals 5660517940
+ 80864542 × 000 resulting in 0
+ 80864542 × 5000 giving us 404322710000
+ 80864542 × 30000 yielding 2425936260000
+ 80864542 × 700000 giving us 56605179400000
+ 80864542 × 2000000 giving us 161729084000000
+ 80864542 × 10000000 yielding 808645420000000

= 1029815764617024
