28925609 has 4 divisors (see below), whose sum is σ = 28943616. Its totient is φ = 28907604.

The previous prime is 28925597. The next prime is 28925621. The reversal of 28925609 is 90652982.

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 (28925597) and next prime (28925621).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28925609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28925629) 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, 6329 + ... + 9894.

It is an arithmetic number, because the mean of its divisors is an integer number (7235904).

Almost surely, 2^28925609 is an apocalyptic number.

It is an amenable number.

28925609 is a deficient number, since it is larger than the sum of its proper divisors (18007).

28925609 is a wasteful number, since it uses less digits than its factorization.

28925609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18006.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 28925609 is about 5378.2533410021. The cubic root of 28925609 is about 306.9687533406.

The spelling of 28925609 in words is "twenty-eight million, nine hundred twenty-five thousand, six hundred nine".