721207716 has 12 divisors (see below), whose sum is σ = 1682818032. Its totient is φ = 240402568.

The previous prime is 721207709. The next prime is 721207733. The reversal of 721207716 is 617702127.

It is a happy number.

721207716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

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, 30050310 + ... + 30050333.

It is an arithmetic number, because the mean of its divisors is an integer number (140234836).

Almost surely, 2^721207716 is an apocalyptic number.

It is an amenable number.

721207716 is an abundant number, since it is smaller than the sum of its proper divisors (961610316).

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

721207716 is a wasteful number, since it uses less digits than its factorization.

721207716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60100650 (or 60100648 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 721207716 is about 26855.3107596989. The cubic root of 721207716 is about 896.7818049489.

The spelling of 721207716 in words is "seven hundred twenty-one million, two hundred seven thousand, seven hundred sixteen".