28310239 has 4 divisors (see below), whose sum is σ = 28474056. Its totient is φ = 28146424.

The previous prime is 28310201. The next prime is 28310251. The reversal of 28310239 is 93201382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28310239 - 2⁷ = 28310111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28310299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81649 + ... + 81994.

It is an arithmetic number, because the mean of its divisors is an integer number (7118514).

Almost surely, 2^28310239 is an apocalyptic number.

28310239 is a deficient number, since it is larger than the sum of its proper divisors (163817).

28310239 is a wasteful number, since it uses less digits than its factorization.

28310239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163816.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28310239 is about 5320.7366971125. The cubic root of 28310239 is about 304.7762903129.

The spelling of 28310239 in words is "twenty-eight million, three hundred ten thousand, two hundred thirty-nine".