Alright, let's work through 72973713 times 64781209 step by step
72973713 × 64781209 = 64781209 × (72973713)
+ 64781209 × 3 producing 194343627
+ 64781209 × 10 producing 647812090
+ 64781209 × 700 yielding 45346846300
+ 64781209 × 3000 that equals 194343627000
+ 64781209 × 70000 what gives us 4534684630000
+ 64781209 × 900000 giving us 58303088100000
+ 64781209 × 2000000 which equals 129562418000000
+ 64781209 × 70000000 that results in 4534684630000000

= 4727325353359017
