720844816 has 20 divisors (see below), whose sum is σ = 1397496492. Its totient is φ = 360200576.

The previous prime is 720844811. The next prime is 720844823. The reversal of 720844816 is 618448027.

It can be written as a sum of positive squares in 2 ways, for example, as 182790400 + 538054416 = 13520^2 + 23196^2 .

It is not an unprimeable number, because it can be changed into a prime (720844811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14730 + ... + 40726.

Almost surely, 2^720844816 is an apocalyptic number.

It is an amenable number.

720844816 is a deficient number, since it is larger than the sum of its proper divisors (676651676).

720844816 is a wasteful number, since it uses less digits than its factorization.

720844816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27738 (or 27732 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 720844816 is about 26848.5533316043. The cubic root of 720844816 is about 896.6313643704.

The spelling of 720844816 in words is "seven hundred twenty million, eight hundred forty-four thousand, eight hundred sixteen".