Integer numbers are whole numbers.  For information on the ranges
  of INTEGER data, see INTEGER (within the DATA CONSTANTS section of
  online Help).

  INTEGER*2, INTEGER*4, and INTEGER*8 values are stored in two's
  complement form.

  Note that logical data type ranges correspond to their comparable
  integer data type ranges.  For example, in LOGICAL*2 L, the range
  for L is the same as the range for INTEGER*2 integers.