28320039 has 12 divisors (see below), whose sum is σ = 44625672. Its totient is φ = 17163600.

The previous prime is 28320031. The next prime is 28320041. The reversal of 28320039 is 93002382.

It is not a de Polignac number, because 28320039 - 2³ = 28320031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28319994 and 28320021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142932 + ... + 143129.

It is an arithmetic number, because the mean of its divisors is an integer number (3718806).

Almost surely, 2^28320039 is an apocalyptic number.

28320039 is a deficient number, since it is larger than the sum of its proper divisors (16305633).

28320039 is a wasteful number, since it uses less digits than its factorization.

28320039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286078 (or 286075 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 28320039 is about 5321.6575425332. The cubic root of 28320039 is about 304.8114538342.

The spelling of 28320039 in words is "twenty-eight million, three hundred twenty thousand, thirty-nine".