721760928 has 96 divisors (see below), whose sum is σ = 2195093376. Its totient is φ = 203378688.

The previous prime is 721760927. The next prime is 721760947. The reversal of 721760928 is 829067127.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 721760928.

It is not an unprimeable number, because it can be changed into a prime (721760927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41700 + ... + 56412.

It is an arithmetic number, because the mean of its divisors is an integer number (22865556).

Almost surely, 2^721760928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721760928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097546688).

721760928 is an abundant number, since it is smaller than the sum of its proper divisors (1473332448).

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

721760928 is a wasteful number, since it uses less digits than its factorization.

721760928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14806 (or 14798 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 721760928 is about 26865.6086474883. The cubic root of 721760928 is about 897.0110424947.

The spelling of 721760928 in words is "seven hundred twenty-one million, seven hundred sixty thousand, nine hundred twenty-eight".