664022644 has 12 divisors (see below), whose sum is σ = 1162258468. Its totient is φ = 331948800.

The previous prime is 664022519. The next prime is 664022693. The reversal of 664022644 is 446220466.

664022644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 105267600 + 558755044 = 10260^2 + 23638^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14884 + ... + 39364.

Almost surely, 2^664022644 is an apocalyptic number.

It is an amenable number.

664022644 is a deficient number, since it is larger than the sum of its proper divisors (498235824).

664022644 is a wasteful number, since it uses less digits than its factorization.

664022644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31266 (or 31264 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 664022644 is about 25768.6368285169. The cubic root of 664022644 is about 872.4240513196.

The spelling of 664022644 in words is "six hundred sixty-four million, twenty-two thousand, six hundred forty-four".