A poll by author Alex Bellos has found, unsurprisingly, that seven is the world's favourite number!
He's released the results to coincide with his new book - Alex Through the Looking-Glass.
Numberphile had its own, less formal poll a while back.
It started with this video:
And then we harvested the stats to make this one:
Seven won that poll also.
Here are some previous appearances by Alex on Numberphile…
And his first book is Here's Looking at Euclid (aka Alex's Adventures in Numberland).