Data Types for Dummies ... INTEGER vs NUMBER(8)

I have a Primary Key field with potential values from 1 to 99,999,999 - this field is a Foriegn key into a table with 2b+ rows .  It is currently defined as a
number(8) , what are the implications and impact of using and integer instead?  

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You cannot define a table with INTEGER as DATATYPE I guess.

INTEGER is a PL/SQL datatype that can be used in procedure/packages etc

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There are no significant impacts - you may use a little more space for holding value, as a INTEGER type will be treated as NUMBER(38)

However, if you only want to hold values 1-99999999 in you primary key and a larger number in invalid, then NUMBER(8) would enforce this, whereas INTEGER would not.
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