We are adding page numbers to our epubs according to the spec defined here. We would like to test this functionality though, are there any readers that support page numbers?
You can display page numbers in iBooks. Just be sure to select the "Tap to show printed page numbers" option in the toc.
Take a look at Infinity Reader. https://play.google.com/store/apps/details?id=com.imeonsoft.infinity
It shows page numbers as well as audio, video and all ePub3 features. The reader comes with a free book, which contains youtube video.
Moreover, you can download a lot of free books.