Passage: In its first week, Meteora debuted at number 1 on the Billboard 200. The album sold at least 810,000 copies its first week of release. As of June 2014, the album has sold 6.7 million copies in the US, and over 27 million copies worldwide. The album was ranked number 36 on Billboard's Hot 200 Albums of the Decade.

Question: How any copies have been sold worldwide?
27 million