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_28 ( population__2011_ INTEGER, land_area__km²_ VARCHAR, population_density__per_km²_ VARCHAR )

### Question ###
How much Population (2011) has a Land area (km ) larger than 15.69, and a Population density (per km ) larger than 57.3?

### Accurate SQL ###

SELECT SUM(population__2011_) FROM table_name_28 WHERE land_area__km²_ > 15.69 AND population_density__per_km²_ > 57.3