328689220 has 48 divisors (see below), whose sum is σ = 732872448. Its totient is φ = 123399680.

The previous prime is 328689211. The next prime is 328689223. The reversal of 328689220 is 22986823.

It is not an unprimeable number, because it can be changed into a prime (328689223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145419 + ... + 147661.

It is an arithmetic number, because the mean of its divisors is an integer number (15268176).

Almost surely, 2^328689220 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 328689220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366436224).

328689220 is an abundant number, since it is smaller than the sum of its proper divisors (404183228).

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

328689220 is a wasteful number, since it uses less digits than its factorization.

328689220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2700 (or 2698 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 328689220 is about 18129.7881951224. The cubic root of 328689220 is about 690.1261549071.

The spelling of 328689220 in words is "three hundred twenty-eight million, six hundred eighty-nine thousand, two hundred twenty".