28319039 has 4 divisors (see below), whose sum is σ = 32364624. Its totient is φ = 24273456.

The previous prime is 28319033. The next prime is 28319041. The reversal of 28319039 is 93091382.

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 28319039 - 2⁸ = 28318783 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 (28319033) 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, 2022782 + ... + 2022795.

It is an arithmetic number, because the mean of its divisors is an integer number (8091156).

Almost surely, 2^28319039 is an apocalyptic number.

28319039 is a deficient number, since it is larger than the sum of its proper divisors (4045585).

28319039 is an equidigital number, since it uses as much as digits as its factorization.

28319039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045584.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 28319039 is about 5321.5635860149. The cubic root of 28319039 is about 304.8078660914.

The spelling of 28319039 in words is "twenty-eight million, three hundred nineteen thousand, thirty-nine".