Alright, let's work through 87270485 times 65807512 step by step
87270485 × 65807512 = 65807512 × (87270485)
+ 65807512 × 5 that equals 329037560
+ 65807512 × 80 yielding 5264600960
+ 65807512 × 400 producing 26323004800
+ 65807512 × 0000 giving us 0
+ 65807512 × 70000 which equals 4606525840000
+ 65807512 × 200000 yielding 13161502400000
+ 65807512 × 7000000 that equals 460652584000000
+ 65807512 × 80000000 giving us 5264600960000000

= 5743053488883320
