720755664 has 40 divisors (see below), whose sum is σ = 1971480960. Its totient is φ = 226119168.

The previous prime is 720755663. The next prime is 720755677. The reversal of 720755664 is 466557027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720755663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440824 + ... + 442455.

It is an arithmetic number, because the mean of its divisors is an integer number (49287024).

Almost surely, 2^720755664 is an apocalyptic number.

It is an amenable number.

720755664 is an abundant number, since it is smaller than the sum of its proper divisors (1250725296).

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

720755664 is a wasteful number, since it uses less digits than its factorization.

720755664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883307 (or 883301 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

The square root of 720755664 is about 26846.8930045918. The cubic root of 720755664 is about 896.5943985893.

The spelling of 720755664 in words is "seven hundred twenty million, seven hundred fifty-five thousand, six hundred sixty-four".