664442212 has 72 divisors (see below), whose sum is σ = 1423360064. Its totient is φ = 265794048.

The previous prime is 664442209. The next prime is 664442237. The reversal of 664442212 is 212244466.

It is a happy number.

664442212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1270183 + ... + 1270705.

Almost surely, 2^664442212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664442212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (711680032).

664442212 is an abundant number, since it is smaller than the sum of its proper divisors (758917852).

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

664442212 is a wasteful number, since it uses less digits than its factorization.

664442212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 706 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 664442212 is about 25776.7766022053. The cubic root of 664442212 is about 872.6077619954.

Adding to 664442212 its reverse (212244466), we get a palindrome (876686678).

The spelling of 664442212 in words is "six hundred sixty-four million, four hundred forty-two thousand, two hundred twelve".