664022 has 4 divisors (see below), whose sum is σ = 996036. Its totient is φ = 332010.

The previous prime is 664019. The next prime is 664043. The reversal of 664022 is 220466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 220466 = 2 ⋅110233.

It is a junction number, because it is equal to n+sod(n) for n = 663985 and 664003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166004 + ... + 166007.

It is an arithmetic number, because the mean of its divisors is an integer number (249009).

2⁶⁶⁴⁰²² is an apocalyptic number.

664022 is a deficient number, since it is larger than the sum of its proper divisors (332014).

664022 is a wasteful number, since it uses less digits than its factorization.

664022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332013.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 664022 is about 814.8754506058. The cubic root of 664022 is about 87.2423769280.

Adding to 664022 its reverse (220466), we get a palindrome (884488).

Subtracting from 664022 its reverse (220466), we obtain a square (443556 = 666²).

The spelling of 664022 in words is "six hundred sixty-four thousand, twenty-two".