27

is the integer between.

Math features

 * 27 is an odd number.
 * 27 is a Harshad number.
 * 27 is a palindrome in binary and octal.
 * 27 is a composite number.
 * 27 is a power of 3.
 * 27 is a cube number and a centered hexagonal pyramidal number.
 * 27 is a deficient number.