664989252 has 24 divisors (see below), whose sum is σ = 1567007232. Its totient is φ = 219468000.

The previous prime is 664989233. The next prime is 664989253. The reversal of 664989252 is 252989466.

664989252 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 = 664989195 and 664989204.

It is not an unprimeable number, because it can be changed into a prime (664989253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273124 + ... + 275547.

It is an arithmetic number, because the mean of its divisors is an integer number (65291968).

Almost surely, 2^664989252 is an apocalyptic number.

It is an amenable number.

664989252 is an abundant number, since it is smaller than the sum of its proper divisors (902017980).

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

664989252 is a wasteful number, since it uses less digits than its factorization.

664989252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548779 (or 548777 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The square root of 664989252 is about 25787.3855208317. The cubic root of 664989252 is about 872.8471710311.

The spelling of 664989252 in words is "six hundred sixty-four million, nine hundred eighty-nine thousand, two hundred fifty-two".