721608044 has 48 divisors (see below), whose sum is σ = 1393822080. Its totient is φ = 325355520.

The previous prime is 721608037. The next prime is 721608047. The reversal of 721608044 is 440806127.

721608044 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 721608044.

It is not an unprimeable number, because it can be changed into a prime (721608047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268829 + ... + 271499.

It is an arithmetic number, because the mean of its divisors is an integer number (29037960).

Almost surely, 2^721608044 is an apocalyptic number.

It is an amenable number.

721608044 is a deficient number, since it is larger than the sum of its proper divisors (672214036).

721608044 is a wasteful number, since it uses less digits than its factorization.

721608044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858 (or 2856 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 721608044 is about 26862.7631490135. The cubic root of 721608044 is about 896.9477028139.

The spelling of 721608044 in words is "seven hundred twenty-one million, six hundred eight thousand, forty-four".