Find the odd number / letters / word from the given alternative:

27
64
125
144

The odd number from the given alternatives is 125.

27, 64, and 144 are all perfect cubes, while 125 is not. A perfect cube is a number that can be expressed as the cube of an integer. For example, 27 is a perfect cube because it can be expressed as the cube of 3 (3 x 3 x 3 = 27). 64 is a perfect cube because it can be expressed as the cube of 4 (4 x 4 x 4 = 64). 144 is a perfect cube because it can be expressed as the cube of 6 (6 x 6 x 6 = 144). However, 125 is not a perfect cube because it cannot be expressed as the cube of an integer.