Just the 118 Spanish caps and 6th on their all time list. But apart from that he barely played!
Haha - I meant relatively around that period when Xavi, Busquets, Alonso, Iniesta were ever present. Sure he'd have come on as sub a few times, started a few games (friendlies and qualifiers etc) but he wasn't the lynchpin of that team. 49 of his appearances have come since a couple of that quartet retired.
You know what I mean to say though - in that context, look for players worse than him who were still talented but barely got a look in, or worse still were never called up. Reina for instance, if he were English or something he'd have a ton more caps than if he were Spanish.
On that note, Silva has a very, very good goalscoring record for Spain. Goals to games ratio wise, it's comparable to Fernando Torres'. Silva is in fact 4th on their all time list on goals scored.