723664 has 20 divisors (see below), whose sum is σ = 1448320. Its totient is φ = 349920.

The previous prime is 723661. The next prime is 723721. The reversal of 723664 is 466327.

723664 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723661) 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, 234 + ... + 1225.

It is an arithmetic number, because the mean of its divisors is an integer number (72416).

2⁷²³⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

723664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

723664 is a wasteful number, since it uses less digits than its factorization.

723664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498 (or 1492 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 723664 is about 850.6844303265. The cubic root of 723664 is about 89.7798735655.

The spelling of 723664 in words is "seven hundred twenty-three thousand, six hundred sixty-four".