Alright, let's work through 99678597 times 84813816 step by step
99678597 × 84813816 = 84813816 × (99678597)
+ 84813816 × 7 that is equal 593696712
+ 84813816 × 90 producing 7633243440
+ 84813816 × 500 which equals 42406908000
+ 84813816 × 8000 giving us 678510528000
+ 84813816 × 70000 that is equal 5936967120000
+ 84813816 × 600000 that equals 50888289600000
+ 84813816 × 9000000 producing 763324344000000
+ 84813816 × 90000000 giving us 7633243440000000

= 8454122185096152
