28665445905 has 24 divisors (see below), whose sum is σ = 51847069248. Its totient is φ = 14623531296.

The previous prime is 28665445891. The next prime is 28665445909. The reversal of 28665445905 is 50954456682.

28665445905 is a `hidden beast` number, since 2 + 8 + 6 + 6 + 5 + 44 + 590 + 5 = 666.

It is not a de Polignac number, because 28665445905 - 2⁵ = 28665445873 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28665445909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13847007 + ... + 13849076.

It is an arithmetic number, because the mean of its divisors is an integer number (2160294552).

Almost surely, 2^28665445905 is an apocalyptic number.

It is an amenable number.

28665445905 is a deficient number, since it is larger than the sum of its proper divisors (23181623343).

28665445905 is a wasteful number, since it uses less digits than its factorization.

28665445905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27696117 (or 27696114 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 54.

The spelling of 28665445905 in words is "twenty-eight billion, six hundred sixty-five million, four hundred forty-five thousand, nine hundred five".