I figure it's somewhere between 1 and 2 billion, so I took every guess that was between the two and averaged them.
So far there was 42 (I didn't check to see which ones were not eligible, but oh well), and out of those I got:
My battletag is zorthy#1881
I'd post the link to my hero but it won't allow a url in the first post.
Pretty cool of you to do this Jaetch.