728331 has 8 divisors (see below), whose sum is σ = 1028304. Its totient is φ = 456960.

The previous prime is 728317. The next prime is 728333. The reversal of 728331 is 133827.

728331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 728331 - 2⁶ = 728267 is a prime.

It is a super-2 number, since 2×728331² = 1060932091122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7090 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (128538).

2⁷²⁸³³¹ is an apocalyptic number.

728331 is a deficient number, since it is larger than the sum of its proper divisors (299973).

728331 is a wasteful number, since it uses less digits than its factorization.

728331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14301.

The product of its digits is 1008, while the sum is 24.

The square root of 728331 is about 853.4231072569. The cubic root of 728331 is about 89.9724607099.

The spelling of 728331 in words is "seven hundred twenty-eight thousand, three hundred thirty-one".