664896320 has 56 divisors (see below), whose sum is σ = 1727228448. Its totient is φ = 241779200.

The previous prime is 664896319. The next prime is 664896347. The reversal of 664896320 is 23698466.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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, 90926 + ... + 97965.

Almost surely, 2^664896320 is an apocalyptic number.

It is an amenable number.

664896320 is an abundant number, since it is smaller than the sum of its proper divisors (1062332128).

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

664896320 is a wasteful number, since it uses less digits than its factorization.

664896320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188919 (or 188909 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 664896320 is about 25785.5835691186. The cubic root of 664896320 is about 872.8065091147.

The spelling of 664896320 in words is "six hundred sixty-four million, eight hundred ninety-six thousand, three hundred twenty".