664972444 has 24 divisors (see below), whose sum is σ = 1204880768. Its totient is φ = 320785920.

The previous prime is 664972433. The next prime is 664972453. The reversal of 664972444 is 444279466.

664972444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 664972394 and 664972403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33832 + ... + 49744.

Almost surely, 2^664972444 is an apocalyptic number.

It is an amenable number.

664972444 is a deficient number, since it is larger than the sum of its proper divisors (539908324).

664972444 is a wasteful number, since it uses less digits than its factorization.

664972444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16285 (or 16283 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 46.

The square root of 664972444 is about 25787.0596229970. The cubic root of 664972444 is about 872.8398170582.

The spelling of 664972444 in words is "six hundred sixty-four million, nine hundred seventy-two thousand, four hundred forty-four".