721051189928 has 32 divisors (see below), whose sum is σ = 1411383778560. Its totient is φ = 344696214720.

The previous prime is 721051189897. The next prime is 721051189933. The reversal of 721051189928 is 829981150127.

It is a self number, because there is not a number n which added to its sum of digits gives 721051189928.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 464288 + ... + 1287503.

It is an arithmetic number, because the mean of its divisors is an integer number (44105743080).

Almost surely, 2^721051189928 is an apocalyptic number.

It is an amenable number.

721051189928 is a deficient number, since it is larger than the sum of its proper divisors (690332588632).

721051189928 is a wasteful number, since it uses less digits than its factorization.

721051189928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754057 (or 1754053 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 53.

The spelling of 721051189928 in words is "seven hundred twenty-one billion, fifty-one million, one hundred eighty-nine thousand, nine hundred twenty-eight".