328861 has 8 divisors (see below), whose sum is σ = 363384. Its totient is φ = 295680.

The previous prime is 328849. The next prime is 328883. The reversal of 328861 is 168823.

328861 = 405² + 406².

It can be written as a sum of positive squares in 4 ways, for example, as 47961 + 280900 = 219^2 + 530^2 .

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 328861 - 2⁵ = 328829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328891) 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, 225 + ... + 841.

It is an arithmetic number, because the mean of its divisors is an integer number (45423).

2³²⁸⁸⁶¹ is an apocalyptic number.

328861 is the 406-th centered square number.

It is an amenable number.

328861 is a deficient number, since it is larger than the sum of its proper divisors (34523).

328861 is a wasteful number, since it uses less digits than its factorization.

328861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its digits is 2304, while the sum is 28.

The square root of 328861 is about 573.4640354896. The cubic root of 328861 is about 69.0246358854.

The spelling of 328861 in words is "three hundred twenty-eight thousand, eight hundred sixty-one".