28274609 has 4 divisors (see below), whose sum is σ = 30845040. Its totient is φ = 25704180.

The previous prime is 28274591. The next prime is 28274611. The reversal of 28274609 is 90647282.

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 a cyclic number.

It is not a de Polignac number, because 28274609 - 2⁸ = 28274353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28274669) 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 3 ways as a sum of consecutive naturals, for example, 1285199 + ... + 1285220.

It is an arithmetic number, because the mean of its divisors is an integer number (7711260).

Almost surely, 2^28274609 is an apocalyptic number.

It is an amenable number.

28274609 is a deficient number, since it is larger than the sum of its proper divisors (2570431).

28274609 is a wasteful number, since it uses less digits than its factorization.

28274609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570430.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 28274609 is about 5317.3874224096. The cubic root of 28274609 is about 304.6483773691.

The spelling of 28274609 in words is "twenty-eight million, two hundred seventy-four thousand, six hundred nine".