326289664 has 36 divisors (see below), whose sum is σ = 658668780. Its totient is φ = 161300480.

The previous prime is 326289637. The next prime is 326289697. The reversal of 326289664 is 466982623.

It can be written as a sum of positive squares in 2 ways, for example, as 24920064 + 301369600 = 4992^2 + 17360^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15624 + ... + 29944.

It is an arithmetic number, because the mean of its divisors is an integer number (18296355).

Almost surely, 2^326289664 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 326289664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329334390).

326289664 is an abundant number, since it is smaller than the sum of its proper divisors (332379116).

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

326289664 is an equidigital number, since it uses as much as digits as its factorization.

326289664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14426 (or 14412 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

The square root of 326289664 is about 18063.4898067898. The cubic root of 326289664 is about 688.4426572654.

The spelling of 326289664 in words is "three hundred twenty-six million, two hundred eighty-nine thousand, six hundred sixty-four".