Is there a way in Fortran to designate an integer value as integer*8 ?

I need many of my integers to be integer*8 in my port to 64 bit.  In C/C++ code, I can say 123456L to mean a long long value, generally 64 bit.  Is there a corresponding way to do this in Fortran or am I stuck with:
     call xyz (1)
     subroutine xyz (ivalue)
     integer*8 ivalue
     ...
     return end
must be:
     integer*8 ivalue
     ...
     ivalue = 1
     call xyz (ivalue)
Thanks,
Lynn