728404 has 6 divisors (see below), whose sum is σ = 1274714. Its totient is φ = 364200.

The previous prime is 728383. The next prime is 728417. The reversal of 728404 is 404827.

728404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 725904 + 2500 = 852^2 + 50^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91047 + ... + 91054.

2⁷²⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

728404 is a deficient number, since it is larger than the sum of its proper divisors (546310).

728404 is a wasteful number, since it uses less digits than its factorization.

728404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182105 (or 182103 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 728404 is about 853.4658751233. The cubic root of 728404 is about 89.9754665640.

The spelling of 728404 in words is "seven hundred twenty-eight thousand, four hundred four".