328990639 has 2 divisors, whose sum is σ = 328990640. Its totient is φ = 328990638.

The previous prime is 328990637. The next prime is 328990687. The reversal of 328990639 is 936099823.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 328990639 - 2¹ = 328990637 is a prime.

Together with 328990637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 328990592 and 328990601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328990637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164495319 + 164495320.

It is an arithmetic number, because the mean of its divisors is an integer number (164495320).

Almost surely, 2^328990639 is an apocalyptic number.

328990639 is a deficient number, since it is larger than the sum of its proper divisors (1).

328990639 is an equidigital number, since it uses as much as digits as its factorization.

328990639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 328990639 is about 18138.0991010635. The cubic root of 328990639 is about 690.3370467050.

The spelling of 328990639 in words is "three hundred twenty-eight million, nine hundred ninety thousand, six hundred thirty-nine".