28508639965 has 32 divisors (see below), whose sum is σ = 38806185600. Its totient is φ = 19931546880.

The previous prime is 28508639959. The next prime is 28508639977. The reversal of 28508639965 is 56993680582.

It is not a de Polignac number, because 28508639965 - 2⁷ = 28508639837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2143506 + ... + 2156764.

It is an arithmetic number, because the mean of its divisors is an integer number (1212693300).

Almost surely, 2^28508639965 is an apocalyptic number.

It is an amenable number.

28508639965 is a deficient number, since it is larger than the sum of its proper divisors (10297545635).

28508639965 is a wasteful number, since it uses less digits than its factorization.

28508639965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15037.

The product of its (nonzero) digits is 27993600, while the sum is 61.

The spelling of 28508639965 in words is "twenty-eight billion, five hundred eight million, six hundred thirty-nine thousand, nine hundred sixty-five".