28431661825884 has 12 divisors (see below), whose sum is σ = 66340544260424. Its totient is φ = 9477220608624.

The previous prime is 28431661825871. The next prime is 28431661825933. The reversal of 28431661825884 is 48852816613482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184652576067 + ... + 1184652576090.

Almost surely, 2^{28431661825884} is an apocalyptic number.

It is an amenable number.

28431661825884 is an abundant number, since it is smaller than the sum of its proper divisors (37908882434540).

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

28431661825884 is a wasteful number, since it uses less digits than its factorization.

28431661825884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369305152164 (or 2369305152162 counting only the distinct ones).

The product of its digits is 141557760, while the sum is 66.

The spelling of 28431661825884 in words is "twenty-eight trillion, four hundred thirty-one billion, six hundred sixty-one million, eight hundred twenty-five thousand, eight hundred eighty-four".