i do believe Fallout:Equestria beats that word count
plus its available in e book...audio book..and recently got published in hardcover
if it doesnt do so by itself you can add in the various side stories(Fallout Equestria: Project Horizons is longer than the original i believe) and absolutely blow that away

from what i hear its pretty damn good...i just dont have the time to start on a story that long atm