28915339 has 4 divisors (see below), whose sum is σ = 28934920. Its totient is φ = 28895760.

The previous prime is 28915319. The next prime is 28915361. The reversal of 28915339 is 93351982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93351982 = 2 ⋅46675991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28915339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28915309) 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, 7377 + ... + 10594.

It is an arithmetic number, because the mean of its divisors is an integer number (7233730).

Almost surely, 2^28915339 is an apocalyptic number.

28915339 is a deficient number, since it is larger than the sum of its proper divisors (19581).

28915339 is a wasteful number, since it uses less digits than its factorization.

28915339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19580.

The product of its digits is 58320, while the sum is 40.

The square root of 28915339 is about 5377.2984852991. The cubic root of 28915339 is about 306.9324194208.

The spelling of 28915339 in words is "twenty-eight million, nine hundred fifteen thousand, three hundred thirty-nine".