Alright, let's work through 72016630 times 64421915 step by step
72016630 × 64421915 = 64421915 × (72016630)
+ 64421915 × 0 producing 0
+ 64421915 × 30 which equals 1932657450
+ 64421915 × 600 yielding 38653149000
+ 64421915 × 6000 that is equal 386531490000
+ 64421915 × 10000 producing 644219150000
+ 64421915 × 000000 what gives us 0
+ 64421915 × 2000000 giving us 128843830000000
+ 64421915 × 70000000 yielding 4509534050000000

= 4639449216446450
