328621 has 2 divisors, whose sum is σ = 328622. Its totient is φ = 328620.

The previous prime is 328619. The next prime is 328633. The reversal of 328621 is 126823.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 3721 = 570^2 + 61^2 .

It is an emirp because it is prime and its reverse (126823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328621 - 2¹ = 328619 is a prime.

Together with 328619, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 328592 and 328601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164310 + 164311.

It is an arithmetic number, because the mean of its divisors is an integer number (164311).

2³²⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

328621 is a deficient number, since it is larger than the sum of its proper divisors (1).

328621 is an equidigital number, since it uses as much as digits as its factorization.

328621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 328621 is about 573.2547426755. The cubic root of 328621 is about 69.0078405989.

It can be divided in two parts, 3286 and 21, that multiplied together give a triangular number (69006 = T₃₇₁).

The spelling of 328621 in words is "three hundred twenty-eight thousand, six hundred twenty-one".