664246272 has 96 divisors (see below), whose sum is σ = 1796361840. Its totient is φ = 218234880.

The previous prime is 664246259. The next prime is 664246291. The reversal of 664246272 is 272642466.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 664246272.

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, 447772 + ... + 449252.

Almost surely, 2^664246272 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 664246272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898180920).

664246272 is an abundant number, since it is smaller than the sum of its proper divisors (1132115568).

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

664246272 is a wasteful number, since it uses less digits than its factorization.

664246272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579 (or 1559 counting only the distinct ones).

The product of its digits is 193536, while the sum is 39.

The square root of 664246272 is about 25772.9756140031. The cubic root of 664246272 is about 872.5219779742.

The spelling of 664246272 in words is "six hundred sixty-four million, two hundred forty-six thousand, two hundred seventy-two".