Persisting Player Prefs On Build in Android

Can I ask for help/guide where I can build 2d game on android device includes the players prefs that I defined already, for example I have an "int" PlayerPrefs (PlayerPrefs.Getint ("mysavenumber")),

the data "mysavenumber" has already a saved integer value in it. How ever upon building my game and installing it on my android device it seems does not hold any value.

How can I build my game with the Playerprefs data that I have defined upon building and installing it on an android device?