321607664 has 60 divisors (see below), whose sum is σ = 729547056. Its totient is φ = 134539776.

The previous prime is 321607633. The next prime is 321607667. The reversal of 321607664 is 466706123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321607667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206312 + ... + 207864.

Almost surely, 2^321607664 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 321607664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364773528).

321607664 is an abundant number, since it is smaller than the sum of its proper divisors (407939392).

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

321607664 is a wasteful number, since it uses less digits than its factorization.

321607664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1605 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 321607664 is about 17933.4230976688. The cubic root of 321607664 is about 685.1339102758.

The spelling of 321607664 in words is "three hundred twenty-one million, six hundred seven thousand, six hundred sixty-four".