328729 has 8 divisors (see below), whose sum is σ = 354888. Its totient is φ = 303360.

The previous prime is 328721. The next prime is 328753. The reversal of 328729 is 927823.

It can be written as a sum of positive squares in 4 ways, for example, as 400 + 328329 = 20^2 + 573^2 .

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 328729 - 2³ = 328721 is a prime.

It is a d-powerful number, because it can be written as 3² + 2¹⁰ + 7 + 8⁶ + 2¹⁶ + 9 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 328729.

It is not an unprimeable number, because it can be changed into a prime (328721) 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, 879 + ... + 1195.

It is an arithmetic number, because the mean of its divisors is an integer number (44361).

2³²⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

328729 is a deficient number, since it is larger than the sum of its proper divisors (26159).

328729 is a wasteful number, since it uses less digits than its factorization.

328729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

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

The square root of 328729 is about 573.3489338963. The cubic root of 328729 is about 69.0153994894.

The spelling of 328729 in words is "three hundred twenty-eight thousand, seven hundred twenty-nine".