Alright, let's work through 73123807 times 81879169 step by step
73123807 × 81879169 = 81879169 × (73123807)
+ 81879169 × 7 which equals 573154183
+ 81879169 × 00 which equals 0
+ 81879169 × 800 that results in 65503335200
+ 81879169 × 3000 producing 245637507000
+ 81879169 × 20000 producing 1637583380000
+ 81879169 × 100000 yielding 8187916900000
+ 81879169 × 3000000 giving us 245637507000000
+ 81879169 × 70000000 giving us 5731541830000000

= 5987316551276383
