To be more precise, AM (longwave and mediumwave) is entirely gone from France. The 162 kHz station at Allouis has been retained for time signals but the carrier has no audio programming. I believe AM is gone from Belgium. The AM operations in Luxembourg are going away. Full-power AM stations are gone from the Netherlands, but the band was opened up for loosely-licensed low-power operations of 100 watts or less. I would not say this is a success. When visiting family there last year, I noticed no local AM activity in Amsterdam (Zuidas) or Leiden*; there was one LPAM station in Eindhoven, broadcasting in English on 747 kHz. I was in an Eindhoven suburb about 10 km away from the station's location. The signal was steady but weak.Not "a number". In some countries, all AM is gone. In others, it is nearly gone and remaining AM facilities are being progressively eliminated.
Interesting that Spain appears to have made few moves to deactivate AM stations (there was never longwave there) even though it has a well-developed complement of FM stations. I can't speak to Portugal, Italy, Germany, or other European countries.
* Footnote: thanks to the North Sea, a substantial number of English mediumwave stations do make it to the cities of the Randstad and sometimes you can even hear groundwave-skywave phase cancellation at night.