28365231 has 8 divisors (see below), whose sum is σ = 40045104. Its totient is φ = 17797760.

The previous prime is 28365223. The next prime is 28365257. The reversal of 28365231 is 13256382.

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

It is a cyclic number.

It is not a de Polignac number, because 28365231 - 2³ = 28365223 is a prime.

It is a super-2 number, since 2×28365231² = 1609172659366722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28365221) 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, 278040 + ... + 278141.

It is an arithmetic number, because the mean of its divisors is an integer number (5005638).

Almost surely, 2^28365231 is an apocalyptic number.

28365231 is a deficient number, since it is larger than the sum of its proper divisors (11679873).

28365231 is a wasteful number, since it uses less digits than its factorization.

28365231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556201.

The product of its digits is 8640, while the sum is 30.

The square root of 28365231 is about 5325.9018954540. The cubic root of 28365231 is about 304.9735030282.

The spelling of 28365231 in words is "twenty-eight million, three hundred sixty-five thousand, two hundred thirty-one".