28258644 has 24 divisors (see below), whose sum is σ = 68211360. Its totient is φ = 9094624.

The previous prime is 28258627. The next prime is 28258661. The reversal of 28258644 is 44685282.

It is an interprime number because it is at equal distance from previous prime (28258627) and next prime (28258661).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 40254 + ... + 40949.

It is an arithmetic number, because the mean of its divisors is an integer number (2842140).

Almost surely, 2^28258644 is an apocalyptic number.

It is an amenable number.

28258644 is an abundant number, since it is smaller than the sum of its proper divisors (39952716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28258644 is a wasteful number, since it uses less digits than its factorization.

28258644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81239 (or 81237 counting only the distinct ones).

The product of its digits is 122880, while the sum is 39.

The square root of 28258644 is about 5315.8860032924. The cubic root of 28258644 is about 304.5910275981.

The spelling of 28258644 in words is "twenty-eight million, two hundred fifty-eight thousand, six hundred forty-four".