integer (decimal)

26
1_234_567                # like 1,234,567 in human writing

integer (hex/oct/binary)

0x1a            # hex     also written as    hex("1a");
032             # oct     also written as    oct("32");
0b11010         # binary  also written as    oct("0b11010");
                # all 3 equal to 26 decimal

real or floating-point

3.5e+3          # 3500