28809591 has 8 divisors (see below), whose sum is σ = 38438400. Its totient is φ = 19193592.

The previous prime is 28809587. The next prime is 28809617. The reversal of 28809591 is 19590882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28809591 - 2² = 28809587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28809541) 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 7 ways as a sum of consecutive naturals, for example, 5196 + ... + 9198.

It is an arithmetic number, because the mean of its divisors is an integer number (4804800).

Almost surely, 2^28809591 is an apocalyptic number.

28809591 is a deficient number, since it is larger than the sum of its proper divisors (9628809).

28809591 is a wasteful number, since it uses less digits than its factorization.

28809591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6405.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 28809591 is about 5367.4566602815. The cubic root of 28809591 is about 306.5577954484.

The spelling of 28809591 in words is "twenty-eight million, eight hundred nine thousand, five hundred ninety-one".