328639 has 2 divisors, whose sum is σ = 328640. Its totient is φ = 328638.

The previous prime is 328637. The next prime is 328651. The reversal of 328639 is 936823.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 328639 - 2¹ = 328637 is a prime.

Together with 328637, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 3⁹ + 2¹⁷ + 6³ + 8³ + 3¹¹ + 9 .

It is a self number, because there is not a number n which added to its sum of digits gives 328639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164319 + 164320.

It is an arithmetic number, because the mean of its divisors is an integer number (164320).

2³²⁸⁶³⁹ is an apocalyptic number.

328639 is a deficient number, since it is larger than the sum of its proper divisors (1).

328639 is an equidigital number, since it uses as much as digits as its factorization.

328639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 328639 is about 573.2704422871. The cubic root of 328639 is about 69.0091005290.

The spelling of 328639 in words is "three hundred twenty-eight thousand, six hundred thirty-nine".