Alright, let's work through 86662736 times 99738394 step by step
86662736 × 99738394 = 99738394 × (86662736)
+ 99738394 × 6 which equals 598430364
+ 99738394 × 30 resulting in 2992151820
+ 99738394 × 700 that equals 69816875800
+ 99738394 × 2000 resulting in 199476788000
+ 99738394 × 60000 giving us 5984303640000
+ 99738394 × 600000 giving us 59843036400000
+ 99738394 × 6000000 that equals 598430364000000
+ 99738394 × 80000000 that is equal 7979071520000000

= 8643602108285984
