28638273636 has 108 divisors (see below), whose sum is σ = 87871597632. Its totient is φ = 7826597856.

The previous prime is 28638273607. The next prime is 28638273679. The reversal of 28638273636 is 63637283682.

It is a happy number.

28638273636 is a `hidden beast` number, since 286 + 38 + 273 + 63 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 312360 + ... + 393503.

It is an arithmetic number, because the mean of its divisors is an integer number (813625904).

Almost surely, 2^28638273636 is an apocalyptic number.

It is an amenable number.

28638273636 is an abundant number, since it is smaller than the sum of its proper divisors (59233323996).

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

28638273636 is a wasteful number, since it uses less digits than its factorization.

28638273636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705910 (or 705898 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 54.

The spelling of 28638273636 in words is "twenty-eight billion, six hundred thirty-eight million, two hundred seventy-three thousand, six hundred thirty-six".