28320887 has 16 divisors (see below), whose sum is σ = 35174400. Its totient is φ = 22252320.

The previous prime is 28320883. The next prime is 28320893. The reversal of 28320887 is 78802382.

It is a cyclic number.

It is not a de Polignac number, because 28320887 - 2² = 28320883 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 28320887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689 + ... + 7557.

It is an arithmetic number, because the mean of its divisors is an integer number (2198400).

Almost surely, 2^28320887 is an apocalyptic number.

28320887 is a deficient number, since it is larger than the sum of its proper divisors (6853513).

28320887 is a wasteful number, since it uses less digits than its factorization.

28320887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6926.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28320887 is about 5321.7372163608. The cubic root of 28320887 is about 304.8144961738.

The spelling of 28320887 in words is "twenty-eight million, three hundred twenty thousand, eight hundred eighty-seven".