Alright, let's work through 83841879 times 96861512 step by step
83841879 × 96861512 = 96861512 × (83841879)
+ 96861512 × 9 producing 871753608
+ 96861512 × 70 which equals 6780305840
+ 96861512 × 800 giving us 77489209600
+ 96861512 × 1000 which equals 96861512000
+ 96861512 × 40000 what gives us 3874460480000
+ 96861512 × 800000 which equals 77489209600000
+ 96861512 × 3000000 that results in 290584536000000
+ 96861512 × 80000000 giving us 7748920960000000

= 8121051168861048
