28575864 has 24 divisors (see below), whose sum is σ = 77393160. Its totient is φ = 9525264.

The previous prime is 28575863. The next prime is 28575881. The reversal of 28575864 is 46857582.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28575863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198372 + ... + 198515.

It is an arithmetic number, because the mean of its divisors is an integer number (3224715).

Almost surely, 2^28575864 is an apocalyptic number.

28575864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28575864 is an abundant number, since it is smaller than the sum of its proper divisors (48817296).

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

28575864 is a wasteful number, since it uses less digits than its factorization.

28575864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396899 (or 396892 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28575864 is about 5345.6397184996. The cubic root of 28575864 is about 305.7265274245.

The spelling of 28575864 in words is "twenty-eight million, five hundred seventy-five thousand, eight hundred sixty-four".