28231 has 8 divisors (see below), whose sum is σ = 33440. Its totient is φ = 23328.

The previous prime is 28229. The next prime is 28277. The reversal of 28231 is 13282.

28231 = T₄₁ + T₄₂ + ... + T₆₁.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(28231) divides (28231-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 28231 - 2¹ = 28229 is a prime.

It is a super-2 number, since 2×28231² = 1593978722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205 + ... + 313.

It is an arithmetic number, because the mean of its divisors is an integer number (4180).

2²⁸²³¹ is an apocalyptic number.

28231 is a deficient number, since it is larger than the sum of its proper divisors (5209).

28231 is a wasteful number, since it uses less digits than its factorization.

28231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153.

The product of its digits is 96, while the sum is 16.

The square root of 28231 is about 168.0208320417. The cubic root of 28231 is about 30.4491673202.

It can be divided in two parts, 282 and 31, that added together give a palindrome (313).

The spelling of 28231 in words is "twenty-eight thousand, two hundred thirty-one".