DECLARE @v VARCHAR(1000)
SET @v = '2,22,5,1,88,2000,7897,800'

SELECT CAST( x.query('fn:min(number)') AS varchar),
       CAST( x.query('fn:max(number)') AS varchar),
       CAST( x.query('fn:count(number)') AS varchar)
FROM 
(
	SELECT CAST('<number>' + REPLACE(@v,',','</number><number>') + '</number>' AS XML) AS X
) s