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_name_23 (district VARCHAR, area__km_2__ VARCHAR)

### Question ###
What is the total population of the district of Klang, with an area larger than 636?

### Accurate SQL ###

SELECT COUNT(2010 AS _population) FROM table_name_23 WHERE district = "klang" AND area__km_2__ > 636