328644864 has 144 divisors (see below), whose sum is σ = 985535040. Its totient is φ = 109361664.

The previous prime is 328644859. The next prime is 328644887. The reversal of 328644864 is 468446823.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559579 + ... + 560165.

Almost surely, 2^328644864 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 328644864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492767520).

328644864 is an abundant number, since it is smaller than the sum of its proper divisors (656890176).

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

328644864 is an frugal number, since it uses more digits than its factorization.

328644864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 592 counting only the distinct ones).

The product of its digits is 884736, while the sum is 45.

The square root of 328644864 is about 18128.5648632207. The cubic root of 328644864 is about 690.0951097628.

The spelling of 328644864 in words is "three hundred twenty-eight million, six hundred forty-four thousand, eight hundred sixty-four".