328990640 has 80 divisors (see below), whose sum is σ = 839651616. Its totient is φ = 118886400.

The previous prime is 328990639. The next prime is 328990687. The reversal of 328990640 is 46099823.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151160 + ... + 153320.

Almost surely, 2^328990640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 328990640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419825808).

328990640 is an abundant number, since it is smaller than the sum of its proper divisors (510660976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

328990640 is a wasteful number, since it uses less digits than its factorization.

328990640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 328990640 is about 18138.0991286298. The cubic root of 328990640 is about 690.3370474044.

The spelling of 328990640 in words is "three hundred twenty-eight million, nine hundred ninety thousand, six hundred forty".