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_65 ( hanyu_pinyin VARCHAR, density___km²_ VARCHAR )

### Question ###
What is the Pinyin for the item that has a density of 77?

### Accurate SQL ###

SELECT hanyu_pinyin FROM table_name_65 WHERE density___km²_ = "77"