How about this Cadavre???.....
Declare @num bigint
Set @num = 12345678
Select @num As Number, Stuff((select Left(Right(Cast(@num As Varchar(10)), n), 1) From Tally
Where n <= Len(Cast(@num As Varchar(10))) For XML Path('')), 1, 1, Right(Cast(@num As Varchar(10)), 1)) As ReverseOfNumber
😛