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_1606824_1 ( area_km_2 VARCHAR, pop_density_people_km_2 VARCHAR )

### Question ###
Name the number of area km 2 for population density is 87

### Accurate SQL ###

SELECT COUNT(area_km_2) FROM table_1606824_1 WHERE pop_density_people_km_2 = "87"