328021812 has 72 divisors (see below), whose sum is σ = 880955712. Its totient is φ = 106660800.

The previous prime is 328021801. The next prime is 328021831. The reversal of 328021812 is 218120823.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35737 + ... + 43967.

It is an arithmetic number, because the mean of its divisors is an integer number (12235496).

Almost surely, 2^328021812 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 328021812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (440477856).

328021812 is an abundant number, since it is smaller than the sum of its proper divisors (552933900).

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

328021812 is a wasteful number, since it uses less digits than its factorization.

328021812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291 (or 8277 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 328021812 is about 18111.3724493756. The cubic root of 328021812 is about 689.6587348341.

The spelling of 328021812 in words is "three hundred twenty-eight million, twenty-one thousand, eight hundred twelve".