442664 has 8 divisors (see below), whose sum is σ = 830010. Its totient is φ = 221328.

The previous prime is 442633. The next prime is 442691. The reversal of 442664 is 466244.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 20164 = 650^2 + 142^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27659 + ... + 27674.

2⁴⁴²⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

442664 is a deficient number, since it is larger than the sum of its proper divisors (387346).

442664 is a wasteful number, since it uses less digits than its factorization.

442664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55339 (or 55335 counting only the distinct ones).

The product of its digits is 4608, while the sum is 26.

The square root of 442664 is about 665.3299933116. The cubic root of 442664 is about 76.2122414504.

The spelling of 442664 in words is "four hundred forty-two thousand, six hundred sixty-four".