664322 has 4 divisors (see below), whose sum is σ = 996486. Its totient is φ = 332160.

The previous prime is 664319. The next prime is 664331. The reversal of 664322 is 223466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 223466 = 2 ⋅111733.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 25921 = 799^2 + 161^2 .

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166079 + ... + 166082.

2⁶⁶⁴³²² is an apocalyptic number.

664322 is a deficient number, since it is larger than the sum of its proper divisors (332164).

664322 is a wasteful number, since it uses less digits than its factorization.

664322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332163.

The product of its digits is 1728, while the sum is 23.

The square root of 664322 is about 815.0595070300. The cubic root of 664322 is about 87.2555134268.

Adding to 664322 its reverse (223466), we get a palindrome (887788).

The spelling of 664322 in words is "six hundred sixty-four thousand, three hundred twenty-two".