28081814388 has 12 divisors (see below), whose sum is σ = 65524233600. Its totient is φ = 9360604792.

The previous prime is 28081814347. The next prime is 28081814399. The reversal of 28081814388 is 88341818082.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28081814388.

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, 1170075588 + ... + 1170075611.

It is an arithmetic number, because the mean of its divisors is an integer number (5460352800).

Almost surely, 2^28081814388 is an apocalyptic number.

It is an amenable number.

28081814388 is an abundant number, since it is smaller than the sum of its proper divisors (37442419212).

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

28081814388 is a wasteful number, since it uses less digits than its factorization.

28081814388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340151206 (or 2340151204 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 51.

The spelling of 28081814388 in words is "twenty-eight billion, eighty-one million, eight hundred fourteen thousand, three hundred eighty-eight".