Alright, let's work through 72030805 times 55313085 step by step
72030805 × 55313085 = 55313085 × (72030805)
+ 55313085 × 5 resulting in 276565425
+ 55313085 × 00 giving us 0
+ 55313085 × 800 that equals 44250468000
+ 55313085 × 0000 giving us 0
+ 55313085 × 30000 which equals 1659392550000
+ 55313085 × 000000 that equals 0
+ 55313085 × 2000000 yielding 110626170000000
+ 55313085 × 70000000 resulting in 3871915950000000

= 3984246039583425
