728122091988 has 48 divisors (see below), whose sum is σ = 1736102995200. Its totient is φ = 237405988224.

The previous prime is 728122091971. The next prime is 728122092023. The reversal of 728122091988 is 889190221827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604938 + ... + 1349886.

It is an arithmetic number, because the mean of its divisors is an integer number (36168812400).

Almost surely, 2^728122091988 is an apocalyptic number.

It is an amenable number.

728122091988 is an abundant number, since it is smaller than the sum of its proper divisors (1007980903212).

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

728122091988 is a wasteful number, since it uses less digits than its factorization.

728122091988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746736 (or 746734 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 57.

The spelling of 728122091988 in words is "seven hundred twenty-eight billion, one hundred twenty-two million, ninety-one thousand, nine hundred eighty-eight".