664978160 has 80 divisors (see below), whose sum is σ = 1927590912. Its totient is φ = 207264000.

The previous prime is 664978129. The next prime is 664978163. The reversal of 664978160 is 61879466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664978163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47816 + ... + 60135.

Almost surely, 2^664978160 is an apocalyptic number.

It is an amenable number.

664978160 is an abundant number, since it is smaller than the sum of its proper divisors (1262612752).

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

664978160 is a wasteful number, since it uses less digits than its factorization.

664978160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107982 (or 107976 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 664978160 is about 25787.1704535414. The cubic root of 664978160 is about 872.8423179830.

The spelling of 664978160 in words is "six hundred sixty-four million, nine hundred seventy-eight thousand, one hundred sixty".