728329 has 4 divisors (see below), whose sum is σ = 832384. Its totient is φ = 624276.

The previous prime is 728317. The next prime is 728333. The reversal of 728329 is 923827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 923827 = 709 ⋅1303.

It is a cyclic number.

It is not a de Polignac number, because 728329 - 2⁹ = 727817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728329.

It is not an unprimeable number, because it can be changed into a prime (728369) 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, 52017 + ... + 52030.

It is an arithmetic number, because the mean of its divisors is an integer number (208096).

2⁷²⁸³²⁹ is an apocalyptic number.

It is an amenable number.

728329 is a deficient number, since it is larger than the sum of its proper divisors (104055).

728329 is a wasteful number, since it uses less digits than its factorization.

728329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104054.

The product of its digits is 6048, while the sum is 31.

The square root of 728329 is about 853.4219355044. The cubic root of 728329 is about 89.9723783549.

The spelling of 728329 in words is "seven hundred twenty-eight thousand, three hundred twenty-nine".