728604331 has 8 divisors (see below), whose sum is σ = 896743904. Its totient is φ = 576478080.

The previous prime is 728604319. The next prime is 728604353. The reversal of 728604331 is 133406827.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 728604331 - 2⁵ = 728604299 is a prime.

It is a super-2 number, since 2×728604331² = 1061728542303915122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728604031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4003230 + ... + 4003411.

It is an arithmetic number, because the mean of its divisors is an integer number (112092988).

Almost surely, 2^728604331 is an apocalyptic number.

728604331 is a deficient number, since it is larger than the sum of its proper divisors (168139573).

728604331 is a wasteful number, since it uses less digits than its factorization.

728604331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006661.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 728604331 is about 26992.6718018058. The cubic root of 728604331 is about 899.8371437838.

The spelling of 728604331 in words is "seven hundred twenty-eight million, six hundred four thousand, three hundred thirty-one".