664659072 has 384 divisors, whose sum is σ = 2444083200. Its totient is φ = 168376320.

The previous prime is 664659067. The next prime is 664659133. The reversal of 664659072 is 270956466.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5233473 + ... + 5233599.

It is an arithmetic number, because the mean of its divisors is an integer number (6364800).

Almost surely, 2^664659072 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 664659072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1222041600).

664659072 is an abundant number, since it is smaller than the sum of its proper divisors (1779424128).

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

664659072 is a wasteful number, since it uses less digits than its factorization.

664659072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 664659072 is about 25780.9827586149. The cubic root of 664659072 is about 872.7026852922.

The spelling of 664659072 in words is "six hundred sixty-four million, six hundred fifty-nine thousand, seventy-two".