28312339 has 8 divisors (see below), whose sum is σ = 30942720. Its totient is φ = 25691400.

The previous prime is 28312321. The next prime is 28312351. The reversal of 28312339 is 93321382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28312339 - 2⁷ = 28312211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28312339.

It is not an unprimeable number, because it can be changed into a prime (28312309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4902 + ... + 8980.

It is an arithmetic number, because the mean of its divisors is an integer number (3867840).

Almost surely, 2^28312339 is an apocalyptic number.

28312339 is a deficient number, since it is larger than the sum of its proper divisors (2630381).

28312339 is a wasteful number, since it uses less digits than its factorization.

28312339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721.

The product of its digits is 7776, while the sum is 31.

The square root of 28312339 is about 5320.9340345469. The cubic root of 28312339 is about 304.7838260363.

The spelling of 28312339 in words is "twenty-eight million, three hundred twelve thousand, three hundred thirty-nine".