Is it possible to change the number format on a custom field of the customer portal

[Nicola Starita]

I need to change the number format of field in the customer portal. Now the info it is shown without any separator. For example, ten millions it is show like 10000000 , when this arrives to an approver it is not simple to check the number. However in the agent screen it is show with the separator: 10.000.000

How can I change this in the customer portal?