28944089 has 4 divisors (see below), whose sum is σ = 29071824. Its totient is φ = 28816356.

The previous prime is 28944077. The next prime is 28944103. The reversal of 28944089 is 98044982.

It is a happy number.

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 28944089 - 2⁸ = 28943833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28944029) 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, 63527 + ... + 63980.

It is an arithmetic number, because the mean of its divisors is an integer number (7267956).

Almost surely, 2^28944089 is an apocalyptic number.

It is an amenable number.

28944089 is a deficient number, since it is larger than the sum of its proper divisors (127735).

28944089 is a wasteful number, since it uses less digits than its factorization.

28944089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127734.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28944089 is about 5379.9710965766. The cubic root of 28944089 is about 307.0341115141.

The spelling of 28944089 in words is "twenty-eight million, nine hundred forty-four thousand, eighty-nine".