28825509 has 16 divisors (see below), whose sum is σ = 40470912. Its totient is φ = 18213888.

The previous prime is 28825499. The next prime is 28825513. The reversal of 28825509 is 90552882.

It is not a de Polignac number, because 28825509 - 2⁸ = 28825253 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28825519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5949 + ... + 9645.

It is an arithmetic number, because the mean of its divisors is an integer number (2529432).

Almost surely, 2^28825509 is an apocalyptic number.

It is an amenable number.

28825509 is a deficient number, since it is larger than the sum of its proper divisors (11645403).

28825509 is a wasteful number, since it uses less digits than its factorization.

28825509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 28825509 is about 5368.9392807146. The cubic root of 28825509 is about 306.6142452667.

The spelling of 28825509 in words is "twenty-eight million, eight hundred twenty-five thousand, five hundred nine".