For the number of files, try running "find /mountpoint -xdev -type f -print | wc -l" (as root).
For the number of inodes, I'm not sure of a filesystem-agnostic command. For Ext2/3/4 filesystems, try "tune2fs -l /dev/sda2" (using correct device name of course). There are similar commands for other filesystem types.
For the total size of all directories under the mount point, you can get the info from the "df -h" and "du -hx" commands.