728424 has 48 divisors (see below), whose sum is σ = 2015520. Its totient is φ = 237600.

The previous prime is 728423. The next prime is 728437. The reversal of 728424 is 424827.

728424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (728423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4749 + ... + 4899.

It is an arithmetic number, because the mean of its divisors is an integer number (41990).

2⁷²⁸⁴²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 728424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1007760).

728424 is an abundant number, since it is smaller than the sum of its proper divisors (1287096).

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

728424 is a wasteful number, since it uses less digits than its factorization.

728424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 223 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 728424 is about 853.4775919730. The cubic root of 728424 is about 89.9762900506.

The spelling of 728424 in words is "seven hundred twenty-eight thousand, four hundred twenty-four".