The domain name 50.com has been purchased and the domain transferred to its new owner, Wang Yi of China.
The domain was brokered by MediaOptions.com under a NDA.
All we know is that the domain was sold and was listed in MediaOptions.copm newsletter back in December 2014, with an asking price of $3.5 Million dollars.
The last reported two numbered .com sale was for 37.com which was sold for $1,968,000 according to DnJournal.com
Congrats to the seller, buyer and MediaOptions.com on what appears to be another 7 figure sale.