28665456 has 40 divisors (see below), whose sum is σ = 76609680. Its totient is φ = 9225216.

The previous prime is 28665449. The next prime is 28665457. The reversal of 28665456 is 65456682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28665457) 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 7 ways as a sum of consecutive naturals, for example, 8905 + ... + 11688.

It is an arithmetic number, because the mean of its divisors is an integer number (1915242).

Almost surely, 2^28665456 is an apocalyptic number.

It is an amenable number.

28665456 is an abundant number, since it is smaller than the sum of its proper divisors (47944224).

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

28665456 is a wasteful number, since it uses less digits than its factorization.

28665456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20633 (or 20627 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 28665456 is about 5354.0130743210. The cubic root of 28665456 is about 306.0457020893.

The spelling of 28665456 in words is "twenty-eight million, six hundred sixty-five thousand, four hundred fifty-six".