720944656 has 80 divisors (see below), whose sum is σ = 1487404800. Its totient is φ = 338088960.

The previous prime is 720944641. The next prime is 720944699. The reversal of 720944656 is 656449027.

It is a happy number.

720944656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×720944656² = 1039522394029916672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2065570 + ... + 2065918.

It is an arithmetic number, because the mean of its divisors is an integer number (18592560).

Almost surely, 2^720944656 is an apocalyptic number.

It is an amenable number.

720944656 is an abundant number, since it is smaller than the sum of its proper divisors (766460144).

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

720944656 is a wasteful number, since it uses less digits than its factorization.

720944656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 720944656 is about 26850.4125852844. The cubic root of 720944656 is about 896.6727581817.

The spelling of 720944656 in words is "seven hundred twenty million, nine hundred forty-four thousand, six hundred fifty-six".