Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_28884858_1 (capacity_percentage VARCHAR, total_attendance VARCHAR)

### Question ###
What is the capacity percentage when the total attendance is 509940?

### Accurate SQL ###

SELECT capacity_percentage FROM table_28884858_1 WHERE total_attendance = 509940