Q: How to recover the apple id if you forget the number to back the password

I'm not quite sure what you are asking. Your Apple ID is normally your email address. If you forgot the password for your Apple ID you can start here: https://iforgot.apple.com.

Sorry - your question is not very clear

If you have forgotten the Apple ID or password -

Forgot iCloud Password

If you have forgotten the passcode to get into your phone

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

If you obtained the phone from someone else and want to sign into it

Turn off Find My iPhone Activation Lock - Apple Support