28080186804 has 18 divisors (see below), whose sum is σ = 70980472290. Its totient is φ = 9360062256.

The previous prime is 28080186737. The next prime is 28080186817. The reversal of 28080186804 is 40868108082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23537696400 + 4542490404 = 153420^2 + 67398^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 28080186804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390002559 + ... + 390002630.

Almost surely, 2^28080186804 is an apocalyptic number.

It is an amenable number.

28080186804 is an abundant number, since it is smaller than the sum of its proper divisors (42900285486).

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

28080186804 is a wasteful number, since it uses less digits than its factorization.

28080186804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780005199 (or 780005194 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The spelling of 28080186804 in words is "twenty-eight billion, eighty million, one hundred eighty-six thousand, eight hundred four".