Various Topics on PHP

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Hello. How do I do this:

If a visitor types in any number after my url, I want mod_rewrite to
convert it to my url/anotherpage.html?number=number_visitor_typed

Example:

http://www.mysite.com/12345678.html

would result in:

http://www.mysite.com/anotherpage.html?number=12345678

another example:

http://www.mysite.com/000111000.html

would result in:

http://www.mysite.com/anotherpage.html?number=000111000

Thank you.