728704 has 16 divisors (see below), whose sum is σ = 1451970. Its totient is φ = 364288.

The previous prime is 728701. The next prime is 728713. The reversal of 728704 is 407827.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 23104 = 840^2 + 152^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (728701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2719 + ... + 2974.

2⁷²⁸⁷⁰⁴ is an apocalyptic number.

It is an amenable number.

728704 is a deficient number, since it is larger than the sum of its proper divisors (723266).

728704 is an equidigital number, since it uses as much as digits as its factorization.

728704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5707 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 728704 is about 853.6416109820. The cubic root of 728704 is about 89.9878172810.

The spelling of 728704 in words is "seven hundred twenty-eight thousand, seven hundred four".