664242 has 16 divisors (see below), whose sum is σ = 1339200. Its totient is φ = 219632.

The previous prime is 664211. The next prime is 664243. The reversal of 664242 is 242466.

It is not an unprimeable number, because it can be changed into a prime (664243) by changing a digit.

664242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523 + ... + 1265.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2⁶⁶⁴²⁴² is an apocalyptic number.

664242 is an abundant number, since it is smaller than the sum of its proper divisors (674958).

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

664242 is a wasteful number, since it uses less digits than its factorization.

664242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897.

The product of its digits is 2304, while the sum is 24.

The square root of 664242 is about 815.0104293811. The cubic root of 664242 is about 87.2520107472.

It can be divided in two parts, 66 and 4242, that multiplied together give a palindrome (279972).

The spelling of 664242 in words is "six hundred sixty-four thousand, two hundred forty-two".