328990637 has 2 divisors, whose sum is σ = 328990638. Its totient is φ = 328990636.

The previous prime is 328990619. The next prime is 328990639. The reversal of 328990637 is 736099823.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248188516 + 80802121 = 15754^2 + 8989^2 .

It is an emirp because it is prime and its reverse (736099823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328990637 - 2⁸ = 328990381 is a prime.

Together with 328990639, 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 = 328990591 and 328990600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328990639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164495318 + 164495319.

It is an arithmetic number, because the mean of its divisors is an integer number (164495319).

Almost surely, 2^328990637 is an apocalyptic number.

It is an amenable number.

328990637 is a deficient number, since it is larger than the sum of its proper divisors (1).

328990637 is an equidigital number, since it uses as much as digits as its factorization.

328990637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 328990637 is about 18138.0990459309. The cubic root of 328990637 is about 690.3370453061.

The spelling of 328990637 in words is "three hundred twenty-eight million, nine hundred ninety thousand, six hundred thirty-seven".