1  declare
  2  numb number;
  3  character varchar2(100);
  4  text varchar2(100);
  5  begin
  6  numb := 123;
  7  character := 'Hello World';
  8  select dump(numb) into text from dual;
  9  dbms_output.put_line(text);
 10  select dump(character) into text from dual;
 11  dbms_output.put_line(text);
 12* end;
SQL> /
Typ=2 Len=3: 194,2,24
Typ=1 Len=11: 72,101,108,108,111,32,87,111,114,108,100