28959009 has 4 divisors (see below), whose sum is σ = 38612016. Its totient is φ = 19306004.

The previous prime is 28958999. The next prime is 28959019. The reversal of 28959009 is 90095982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28958999) and next prime (28959019).

It is a cyclic number.

It is not a de Polignac number, because 28959009 - 2⁵ = 28958977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28959019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4826499 + ... + 4826504.

It is an arithmetic number, because the mean of its divisors is an integer number (9653004).

Almost surely, 2^28959009 is an apocalyptic number.

It is an amenable number.

28959009 is a deficient number, since it is larger than the sum of its proper divisors (9653007).

28959009 is an equidigital number, since it uses as much as digits as its factorization.

28959009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9653006.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 28959009 is about 5381.3575424794. The cubic root of 28959009 is about 307.0868587497.

The spelling of 28959009 in words is "twenty-eight million, nine hundred fifty-nine thousand, nine".