WhatsApp Riddle: How Many Were Going To Saint Ives?

Enjoy the tricky riddle that I received on WhatsApp today. As I was going to Saint Ives, I crossed the path of seven wives. Every wife had seven sacks, Every sack had seven cats, Every cat had seven kittens, Kittens, cats, sacks, wives, How many were going to Saint Ives? So were you able to