28156 has 6 divisors (see below), whose sum is σ = 49280. Its totient is φ = 14076.

The previous prime is 28151. The next prime is 28163. The reversal of 28156 is 65182.

It is a happy number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28151) by changing a digit.

28156 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3516 + ... + 3523.

2²⁸¹⁵⁶ is an apocalyptic number.

It is an amenable number.

28156 is a deficient number, since it is larger than the sum of its proper divisors (21124).

28156 is a wasteful number, since it uses less digits than its factorization.

28156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043 (or 7041 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 28156 is about 167.7974970016. The cubic root of 28156 is about 30.4221791056.

The spelling of 28156 in words is "twenty-eight thousand, one hundred fifty-six".