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

### Instruction:
How many opponents were there at the game with 64,087 people in attendance?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'Opponent', 'Result', 'Kickoff [a ]', 'Game site', 'TV', 'Attendance', 'Record']

### Response:
SELECT COUNT Opponent FROM table WHERE Attendance = 64,087