664257888 has 96 divisors (see below), whose sum is σ = 2214213120. Its totient is φ = 189786240.

The previous prime is 664257887. The next prime is 664257907. The reversal of 664257888 is 888752466.

664257888 is a `hidden beast` number, since 6 + 64 + 2 + 578 + 8 + 8 = 666.

664257888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664257887) 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, 48868 + ... + 60963.

It is an arithmetic number, because the mean of its divisors is an integer number (23064720).

Almost surely, 2^664257888 is an apocalyptic number.

It is an amenable number.

664257888 is an abundant number, since it is smaller than the sum of its proper divisors (1549955232).

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

664257888 is a wasteful number, since it uses less digits than its factorization.

664257888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109857 (or 109843 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The square root of 664257888 is about 25773.2009653438. The cubic root of 664257888 is about 872.5270640177.

The spelling of 664257888 in words is "six hundred sixty-four million, two hundred fifty-seven thousand, eight hundred eighty-eight".