28081815692 has 24 divisors (see below), whose sum is σ = 56366403744. Its totient is φ = 11991612672.

The previous prime is 28081815677. The next prime is 28081815731. The reversal of 28081815692 is 29651818082.

It is a self number, because there is not a number n which added to its sum of digits gives 28081815692.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1802573 + ... + 1818084.

It is an arithmetic number, because the mean of its divisors is an integer number (2348600156).

Almost surely, 2^28081815692 is an apocalyptic number.

It is an amenable number.

28081815692 is an abundant number, since it is smaller than the sum of its proper divisors (28284588052).

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

28081815692 is a wasteful number, since it uses less digits than its factorization.

28081815692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3620945 (or 3620943 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 50.

The spelling of 28081815692 in words is "twenty-eight billion, eighty-one million, eight hundred fifteen thousand, six hundred ninety-two".