Find the full name and popularity of the professor who advises the most number of students.
full name of the professor = first_name, last_name; most number of students refers to MAX(COUNT(student_id));
SELECT T1.first_name, T1.last_name, T1.popularity FROM prof AS T1 INNER JOIN RA AS T2 ON T1.prof_id = T2.prof_id GROUP BY T1.prof_id ORDER BY COUNT(T2.student_id) DESC LIMIT 1