721264044 has 24 divisors (see below), whose sum is σ = 1683702720. Its totient is φ = 240313744.

The previous prime is 721264039. The next prime is 721264057. The reversal of 721264044 is 440462127.

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 7 ways as a sum of consecutive naturals, for example, 17287 + ... + 41729.

It is an arithmetic number, because the mean of its divisors is an integer number (70154280).

Almost surely, 2^721264044 is an apocalyptic number.

It is an amenable number.

721264044 is an abundant number, since it is smaller than the sum of its proper divisors (962438676).

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

721264044 is a wasteful number, since it uses less digits than its factorization.

721264044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26909 (or 26907 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The square root of 721264044 is about 26856.3594703377. The cubic root of 721264044 is about 896.8051512560.

The spelling of 721264044 in words is "seven hundred twenty-one million, two hundred sixty-four thousand, forty-four".