28604289 has 24 divisors (see below), whose sum is σ = 45804288. Its totient is φ = 15815520.

The previous prime is 28604281. The next prime is 28604297. The reversal of 28604289 is 98240682.

It is an interprime number because it is at equal distance from previous prime (28604281) and next prime (28604297).

It is not a de Polignac number, because 28604289 - 2³ = 28604281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28604281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1419 + ... + 7695.

It is an arithmetic number, because the mean of its divisors is an integer number (1908512).

Almost surely, 2^28604289 is an apocalyptic number.

It is an amenable number.

28604289 is a deficient number, since it is larger than the sum of its proper divisors (17199999).

28604289 is a wasteful number, since it uses less digits than its factorization.

28604289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325 (or 6318 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28604289 is about 5348.2977665796. The cubic root of 28604289 is about 305.8278646540.

The spelling of 28604289 in words is "twenty-eight million, six hundred four thousand, two hundred eighty-nine".