721942928 has 20 divisors (see below), whose sum is σ = 1598588160. Its totient is φ = 309404064.

The previous prime is 721942919. The next prime is 721942931. The reversal of 721942928 is 829249127.

721942928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3222848 + ... + 3223071.

It is an arithmetic number, because the mean of its divisors is an integer number (79929408).

Almost surely, 2^721942928 is an apocalyptic number.

It is an amenable number.

721942928 is an abundant number, since it is smaller than the sum of its proper divisors (876645232).

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

721942928 is a wasteful number, since it uses less digits than its factorization.

721942928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445934 (or 6445928 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 721942928 is about 26868.9956641479. The cubic root of 721942928 is about 897.0864332430.

The spelling of 721942928 in words is "seven hundred twenty-one million, nine hundred forty-two thousand, nine hundred twenty-eight".