28582809 has 16 divisors (see below), whose sum is σ = 38742912. Its totient is φ = 18741888.

The previous prime is 28582789. The next prime is 28582861. The reversal of 28582809 is 90828582.

It is not a de Polignac number, because 28582809 - 2⁹ = 28582297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28582889) 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, 71799 + ... + 72195.

It is an arithmetic number, because the mean of its divisors is an integer number (2421432).

Almost surely, 2^28582809 is an apocalyptic number.

It is an amenable number.

28582809 is a deficient number, since it is larger than the sum of its proper divisors (10160103).

28582809 is a wasteful number, since it uses less digits than its factorization.

28582809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736.

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 28582809 is about 5346.2892738796. The cubic root of 28582809 is about 305.7512930652.

The spelling of 28582809 in words is "twenty-eight million, five hundred eighty-two thousand, eight hundred nine".