328820391 has 10 divisors (see below), whose sum is σ = 491200952. Its totient is φ = 219213540.

The previous prime is 328820339. The next prime is 328820407. The reversal of 328820391 is 193028823.

It is a happy number.

It is not a de Polignac number, because 328820391 - 2⁹ = 328819879 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 (328820491) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2029675 + ... + 2029836.

Almost surely, 2^328820391 is an apocalyptic number.

328820391 is a deficient number, since it is larger than the sum of its proper divisors (162380561).

328820391 is an equidigital number, since it uses as much as digits as its factorization.

328820391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059523 (or 4059514 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 328820391 is about 18133.4053889500. The cubic root of 328820391 is about 690.2179462742.

The spelling of 328820391 in words is "three hundred twenty-eight million, eight hundred twenty thousand, three hundred ninety-one".