Convert Second to Hour in Sql Server function

CREATE FUNCTION [dbo].[SecTOHour]
(
@Second1 BIGINT=0
)
RETURNS TIME
AS
BEGIN
DECLARE @Res TIME =NULL

SET @Second1=ABS(@Second1)
DECLARE @ETIME AS VARCHAR(20)
SELECT @ETIME = RIGHT(CAST(@Second1 / 3600 AS VARCHAR(10)),7) + '.' +
RIGHT('0' + CAST((@Second1 / 60) % 60 AS VARCHAR(10)),2) + ':' + RIGHT('0' + CAST(@Second1 % 60 AS VARCHAR(2)),2)
SELECT @RES= CAST(REPLACE(@ETIME,'.',':') AS TIME)
RETURN @RES
END