Probably close to 8 to 10 megapixels. Consumer level film scanners can pull up to 10 megapixels of information (~4000 x 2800) off a 35mm frame, but compared to digital, film has a lot of grain (aka noise), so not all of those megapixels may be useful. A smaller high quality digital image can look equally as good as a noisier film image.

The previous generation 6mp digital SLR's were pretty close to 35mm in terms of practical comparisons, the new ones in the 8 to 12mp range are probably equivalent or superior.

What's the application?