28956 has 24 divisors (see below), whose sum is σ = 71680. Its totient is φ = 9072.

The previous prime is 28949. The next prime is 28961. The reversal of 28956 is 65982.

It is a congruent number.

It is an unprimeable number.

28956 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165 + ... + 291.

2²⁸⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35840).

28956 is an abundant number, since it is smaller than the sum of its proper divisors (42724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28956 is a wasteful number, since it uses less digits than its factorization.

28956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 151 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 28956 is about 170.1646261712. The cubic root of 28956 is about 30.7076222378.

The spelling of 28956 in words is "twenty-eight thousand, nine hundred fifty-six".