Alright, let's work through 84142724 times 89721692 step by step
84142724 × 89721692 = 89721692 × (84142724)
+ 89721692 × 4 that results in 358886768
+ 89721692 × 20 resulting in 1794433840
+ 89721692 × 700 yielding 62805184400
+ 89721692 × 2000 that results in 179443384000
+ 89721692 × 40000 what gives us 3588867680000
+ 89721692 × 100000 what gives us 8972169200000
+ 89721692 × 4000000 yielding 358886768000000
+ 89721692 × 80000000 that results in 7177735360000000

= 7549427566769008
