Above: the Verge article announcing AppStore hitting a million apps.

Here's the article where Android hit 1 million apps in Google Play:

http://readwrite.com/2013/07/24/google-play-hits-one-million-android-apps

I found that on this Android statistics page:

http://expandedramblings.com/index.php/android-statistics/

AndroidRank says at least 180,000 apps have achieved 10,000 installs:

http://www.androidrank.org/categorystats?category=&price=all&hl=en

There are over fifty Android apps with more than 100 million installs:

http://en.wikipedia.org/wiki/List_of_most_downloaded_Android_applications

"As of September 2013, Google Android OS have been installed on 80% of the world smartphones according to industry analysis, and there have been more than 1 billion Android mobile activations."

That said, many apps lose their peak users within 3 months:

Fun article from 2009: "Can developers still make money in the AppStore?"

http://blog.flurry.com/bid/18265/Can-Developers-Still-Make-Money-in-the-iPhone-App-Store

Six years into the mobile revolution:

The rise of the mobile addict:

It's an app world -- the web just lives in it:

Still, just a few companies have all of the engagement: