664971296 has 48 divisors (see below), whose sum is σ = 1442121408. Its totient is φ = 299308800.

The previous prime is 664971283. The next prime is 664971311. The reversal of 664971296 is 692179466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27086 + ... + 45426.

It is an arithmetic number, because the mean of its divisors is an integer number (30044196).

Almost surely, 2^664971296 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 664971296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721060704).

664971296 is an abundant number, since it is smaller than the sum of its proper divisors (777150112).

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

664971296 is a wasteful number, since it uses less digits than its factorization.

664971296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18465 (or 18457 counting only the distinct ones).

The product of its digits is 979776, while the sum is 50.

The square root of 664971296 is about 25787.0373637609. The cubic root of 664971296 is about 872.8393147714.

The spelling of 664971296 in words is "six hundred sixty-four million, nine hundred seventy-one thousand, two hundred ninety-six".