Alright, let's work through 87828839 times 18749299 step by step
87828839 × 18749299 = 18749299 × (87828839)
+ 18749299 × 9 resulting in 168743691
+ 18749299 × 30 what gives us 562478970
+ 18749299 × 800 that equals 14999439200
+ 18749299 × 8000 what gives us 149994392000
+ 18749299 × 20000 producing 374985980000
+ 18749299 × 800000 that results in 14999439200000
+ 18749299 × 7000000 yielding 131245093000000
+ 18749299 × 80000000 giving us 1499943920000000

= 1646729163233861
