Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many codes have a density of 621.68, and a Land area (hectares) larger than 75.28?

### Inputs:
table_name: table, columns: ['Urban area (locality)', 'Population', 'Land area (hectares)', 'Density (inh./km²)', 'Code']

### Response:
SELECT SUM Code FROM table WHERE Density (inh./km²) = 621.68 AND Land area (hectares) > 75.28