328643880 has 64 divisors (see below), whose sum is σ = 989591040. Its totient is φ = 87313152.

The previous prime is 328643873. The next prime is 328643897. The reversal of 328643880 is 88346823.

It is a super-2 number, since 2×328643880² = 216013599722908800, which contains 22 as substring.

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, 28297 + ... + 38183.

It is an arithmetic number, because the mean of its divisors is an integer number (15462360).

Almost surely, 2^328643880 is an apocalyptic number.

328643880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 328643880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (494795520).

328643880 is an abundant number, since it is smaller than the sum of its proper divisors (660947160).

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

328643880 is a wasteful number, since it uses less digits than its factorization.

328643880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10178 (or 10174 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 328643880 is about 18128.5377237106. The cubic root of 328643880 is about 690.0944210211.

The spelling of 328643880 in words is "three hundred twenty-eight million, six hundred forty-three thousand, eight hundred eighty".