28320959 has 4 divisors (see below), whose sum is σ = 28342080. Its totient is φ = 28299840.

The previous prime is 28320953. The next prime is 28320979. The reversal of 28320959 is 95902382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95902382 = 2 ⋅47951191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28320959 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 (28320953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8402 + ... + 11279.

It is an arithmetic number, because the mean of its divisors is an integer number (7085520).

Almost surely, 2^28320959 is an apocalyptic number.

28320959 is a deficient number, since it is larger than the sum of its proper divisors (21121).

28320959 is a wasteful number, since it uses less digits than its factorization.

28320959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21120.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28320959 is about 5321.7439810649. The cubic root of 28320959 is about 304.8147544829.

The spelling of 28320959 in words is "twenty-eight million, three hundred twenty thousand, nine hundred fifty-nine".