Get Order Increment Id in Magento

Question

I\'m trying to get the Order Increment Id in Magento, on the success.phtml page so that I can use this for affiliate tracking.

I\'m using the following code, but it

Answer 1

getRealOrderId() appears to return the order number as presented in data grids. getId() will return the internal id of row in the database, which you probably don't want.