728724 has 12 divisors (see below), whose sum is σ = 1700384. Its totient is φ = 242904.

The previous prime is 728723. The next prime is 728729. The reversal of 728724 is 427827.

728724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 728691 and 728700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728723) 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, 30352 + ... + 30375.

2⁷²⁸⁷²⁴ is an apocalyptic number.

It is an amenable number.

728724 is an abundant number, since it is smaller than the sum of its proper divisors (971660).

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

728724 is a wasteful number, since it uses less digits than its factorization.

728724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60734 (or 60732 counting only the distinct ones).

The product of its digits is 6272, while the sum is 30.

The square root of 728724 is about 853.6533254196. The cubic root of 728724 is about 89.9886405416.

The spelling of 728724 in words is "seven hundred twenty-eight thousand, seven hundred twenty-four".