721588704 has 48 divisors (see below), whose sum is σ = 1902090960. Its totient is φ = 239523840.

The previous prime is 721588667. The next prime is 721588711. The reversal of 721588704 is 407885127.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7542 + ... + 38730.

It is an arithmetic number, because the mean of its divisors is an integer number (39626895).

Almost surely, 2^721588704 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 721588704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951045480).

721588704 is an abundant number, since it is smaller than the sum of its proper divisors (1180502256).

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

721588704 is a wasteful number, since it uses less digits than its factorization.

721588704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31443 (or 31435 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 42.

The square root of 721588704 is about 26862.4031687413. The cubic root of 721588704 is about 896.9396896348.

The spelling of 721588704 in words is "seven hundred twenty-one million, five hundred eighty-eight thousand, seven hundred four".