728664 has 32 divisors (see below), whose sum is σ = 1846320. Its totient is φ = 239616.

The previous prime is 728659. The next prime is 728681. The reversal of 728664 is 466827.

728664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

728664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172 + ... + 2484.

2⁷²⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

728664 is an abundant number, since it is smaller than the sum of its proper divisors (1117656).

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

728664 is a wasteful number, since it uses less digits than its factorization.

728664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 415 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 728664 is about 853.6181816245. The cubic root of 728664 is about 89.9861707146.

The spelling of 728664 in words is "seven hundred twenty-eight thousand, six hundred sixty-four".