18761380728 has 64 divisors (see below), whose sum is σ = 48781056000. Its totient is φ = 6007727232.

The previous prime is 18761380709. The next prime is 18761380733. The reversal of 18761380728 is 82708316781.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63568 + ... + 203871.

It is an arithmetic number, because the mean of its divisors is an integer number (762204000).

Almost surely, 2^18761380728 is an apocalyptic number.

It is an amenable number.

18761380728 is an abundant number, since it is smaller than the sum of its proper divisors (30019675272).

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

18761380728 is a wasteful number, since it uses less digits than its factorization.

18761380728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267564 (or 267560 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 18761380728 in words is "eighteen billion, seven hundred sixty-one million, three hundred eighty thousand, seven hundred twenty-eight".