28595309 has 8 divisors (see below), whose sum is σ = 30591288. Its totient is φ = 26634240.

The previous prime is 28595293. The next prime is 28595311. The reversal of 28595309 is 90359582.

It can be written as a sum of positive squares in 4 ways, for example, as 13213225 + 15382084 = 3635^2 + 3922^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28595309 - 2⁴ = 28595293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28595909) 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 7 ways as a sum of consecutive naturals, for example, 7022 + ... + 10319.

It is an arithmetic number, because the mean of its divisors is an integer number (3823911).

Almost surely, 2^28595309 is an apocalyptic number.

It is an amenable number.

28595309 is a deficient number, since it is larger than the sum of its proper divisors (1995979).

28595309 is a wasteful number, since it uses less digits than its factorization.

28595309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17455.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 28595309 is about 5347.4581812297. The cubic root of 28595309 is about 305.7958575464.

The spelling of 28595309 in words is "twenty-eight million, five hundred ninety-five thousand, three hundred nine".