28965839 has 4 divisors (see below), whose sum is σ = 33103824. Its totient is φ = 24827856.

The previous prime is 28965829. The next prime is 28965887. The reversal of 28965839 is 93856982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93856982 = 2 ⋅46928491.

It is a cyclic number.

It is not a de Polignac number, because 28965839 - 2²⁴ = 12188623 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 (28965829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2068982 + ... + 2068995.

It is an arithmetic number, because the mean of its divisors is an integer number (8275956).

Almost surely, 2^28965839 is an apocalyptic number.

28965839 is a deficient number, since it is larger than the sum of its proper divisors (4137985).

28965839 is an equidigital number, since it uses as much as digits as its factorization.

28965839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137984.

The product of its digits is 933120, while the sum is 50.

The square root of 28965839 is about 5381.9921033015. The cubic root of 28965839 is about 307.1109990599.

The spelling of 28965839 in words is "twenty-eight million, nine hundred sixty-five thousand, eight hundred thirty-nine".