Uh, the only 6.47 million number I am finding is software in the US. VGC seems to have the same (slightly more) for the same time period. Hardware shipments stood at 34.98 million at the end of September. In comparison VGC has 34.81m sold to consumers as of September 28th. At least as of that point in time, the 3DS was overtracked.
Predictions for LT console sales: