28081646616 has 16 divisors (see below), whose sum is σ = 70204116600. Its totient is φ = 9360548864.

The previous prime is 28081646557. The next prime is 28081646627. The reversal of 28081646616 is 61664618082.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 585034281 + ... + 585034328.

Almost surely, 2^28081646616 is an apocalyptic number.

It is an amenable number.

28081646616 is an abundant number, since it is smaller than the sum of its proper divisors (42122469984).

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

28081646616 is a wasteful number, since it uses less digits than its factorization.

28081646616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170068618 (or 1170068614 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 28081646616 in words is "twenty-eight billion, eighty-one million, six hundred forty-six thousand, six hundred sixteen".