328191920 has 40 divisors (see below), whose sum is σ = 872054304. Its totient is φ = 112522752.

The previous prime is 328191911. The next prime is 328191931. The reversal of 328191920 is 29191823.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292469 + ... + 293588.

Almost surely, 2^328191920 is an apocalyptic number.

It is an amenable number.

328191920 is an abundant number, since it is smaller than the sum of its proper divisors (543862384).

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

328191920 is a wasteful number, since it uses less digits than its factorization.

328191920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586077 (or 586071 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 328191920 is about 18116.0680060547. The cubic root of 328191920 is about 689.7779303571. Note that the first 3 decimals are identical.

The spelling of 328191920 in words is "three hundred twenty-eight million, one hundred ninety-one thousand, nine hundred twenty".