Here are the exact numbers and a link to a great site for NFL draft history.
1). Notre Dame......... 447
2). USC.................... 420
3). Ohio State........... 363
4). Oklahoma............ 321
5). Nebraska............. 317
6). Michigan.............. 315
7). Tennessee........... 306
8). Penn State........... 299
9). Texas.................. 294
10). UCLA................. 278
complete list.......
http://www.drafthistory.com/n_college/college_n.html