Update On A Integer Field

Hi everybody,
Could someone help me ???
Iam starting with sql

My problem ..

Ihave a table Table_customer

In this table a column Table_customer.no
This column contain 8000 rows.
with customer numbers: like 30789
I would like to modify once all this row adding just before the number
a value to all these rows.This value will be a 60
So will have instaed of 30789 a 6030789
This column is an integer.

I have try a simple select wich give me this result
How i can do this with update ?
probably i have to convert fisrt to caracters

select kunr,nov_kunr=
'30'+ltrim(str(kunr))
from event
where kunr is not null

Thank