Running this will explain it:

SELECT 575629 / 54

When integer dividend is divided by an integer divisor the result is an
integer that has any fractional part of the result truncated, so you get
10659.

But try this:
SELECT CAST(575629 / 54.0 AS DECIMAL(10 , 0))

or

SELECT CAST(1.0 * 575629 / 54 AS DECIMAL(10 , 0))

Those will give you the expected result 10660, because the higher precedence
argument data type is the resulting data type of the division.

HTH,

Plamen Ratchev
http://www.SQLStudio.com