Page numbers are meaningless on ebooks. They only work as intended on PDFs because PDFs are a way to proof content for paper.
Ebooks MUST reflow, have user changeable linespacing, font face, font size and margins. Also the resolution can be from 72 DPI to 300 DPI, the screen size from 3" to 14" and the screen aspect ratio can vary.
Some ereaders will create "fake" page numbers. Also epub can have Adobe page numbers. You can put a page number at a paragraph break in the body at the margin corresponding to "real" page numbering for a particular paper edition. It's horrible and I have removed it by editing the epub files on the few books I've found that do it.
Different paper editions often have different page numbering.
On paper the purpose of a page number is to find a page. The ebook uses phrase/word search and links in a Table Of Contents or a full Index, so page numbers for lookup are not required and won't work that way anyway.
Footnotes are a separate subject. They are needed for reference works and involve links in the text. Best avoided and replaced by inline right justified paragraphs in fiction texts.
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