Octomom Made 28K Last Month

It might be her most successful month since the height of her octo-fame ... sources close to Nadya Suleman tell TMZ, the self-loathing mother of 14 -- who recently told InTouch that she "hates" her babies -- has successfully turned her tortured existence into a profitable business.

We're told Nadya made her money doing various things like "Celebridate," The Cable Show in Chicago, MMA fights, a celebrity boxing match, bikini photo shoots, and several paid interviews across the globe.

And she has more paid gigs in the pipeline -- including another celebrity boxing match, several more interviews, and a possible instructional workout video.