28917805 has 16 divisors (see below), whose sum is σ = 39836160. Its totient is φ = 19740672.

The previous prime is 28917797. The next prime is 28917821. The reversal of 28917805 is 50871982.

It is not a de Polignac number, because 28917805 - 2³ = 28917797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6637 + ... + 10093.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^28917805 is an apocalyptic number.

It is an amenable number.

28917805 is a deficient number, since it is larger than the sum of its proper divisors (10918355).

28917805 is a wasteful number, since it uses less digits than its factorization.

28917805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28917805 is about 5377.5277777060. The cubic root of 28917805 is about 306.9411445918.

The spelling of 28917805 in words is "twenty-eight million, nine hundred seventeen thousand, eight hundred five".