28032239 has 12 divisors (see below), whose sum is σ = 30857400. Its totient is φ = 25393104.

The previous prime is 28032227. The next prime is 28032287. The reversal of 28032239 is 93223082.

It is not a de Polignac number, because 28032239 - 2¹⁶ = 27966703 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28032839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8657 + ... + 11445.

It is an arithmetic number, because the mean of its divisors is an integer number (2571450).

Almost surely, 2^28032239 is an apocalyptic number.

28032239 is a deficient number, since it is larger than the sum of its proper divisors (2825161).

28032239 is a wasteful number, since it uses less digits than its factorization.

28032239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854 (or 2831 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 28032239 is about 5294.5480449232. The cubic root of 28032239 is about 303.7753960488.

The spelling of 28032239 in words is "twenty-eight million, thirty-two thousand, two hundred thirty-nine".