321669644 has 12 divisors (see below), whose sum is σ = 563070144. Its totient is φ = 160792464.

The previous prime is 321669643. The next prime is 321669661. The reversal of 321669644 is 446966123.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (321669643) by changing a digit.

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, 11717 + ... + 27939.

It is an arithmetic number, because the mean of its divisors is an integer number (46922512).

Almost surely, 2^321669644 is an apocalyptic number.

It is an amenable number.

321669644 is a deficient number, since it is larger than the sum of its proper divisors (241400500).

321669644 is a wasteful number, since it uses less digits than its factorization.

321669644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21184 (or 21182 counting only the distinct ones).

The product of its digits is 186624, while the sum is 41.

The square root of 321669644 is about 17935.1510726841. The cubic root of 321669644 is about 685.1779202885.

The spelling of 321669644 in words is "three hundred twenty-one million, six hundred sixty-nine thousand, six hundred forty-four".