Make invoice number start from a custom number enstead of 0001

Hello, this module is awesome, but Im having legar troubbles when trying to implement this module in my bussiness, for example, need the number of my invoices start from 645825, instead of 0001, how can I change this? I cannot begin my invoices from 0001 because it is not legal since in my country I must continue the number of my last invoices so, I need to make it begin from 645825 enstead of 1.

How can I achieve this? thanks