721723264 has 32 divisors (see below), whose sum is σ = 1440690840. Its totient is φ = 360138240.

The previous prime is 721723241. The next prime is 721723267. The reversal of 721723264 is 462327127.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721723267) 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, 61554 + ... + 72334.

Almost surely, 2^721723264 is an apocalyptic number.

It is an amenable number.

721723264 is a deficient number, since it is larger than the sum of its proper divisors (718967576).

721723264 is a wasteful number, since it uses less digits than its factorization.

721723264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11318 (or 11306 counting only the distinct ones).

The product of its digits is 28224, while the sum is 34.

The square root of 721723264 is about 26864.9076678108. The cubic root of 721723264 is about 896.9954391694.

The spelling of 721723264 in words is "seven hundred twenty-one million, seven hundred twenty-three thousand, two hundred sixty-four".