664923888 has 60 divisors (see below), whose sum is σ = 1872779688. Its totient is φ = 220222080.

The previous prime is 664923881. The next prime is 664923949. The reversal of 664923888 is 888329466.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664923881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7903 + ... + 37313.

Almost surely, 2^664923888 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 664923888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936389844).

664923888 is an abundant number, since it is smaller than the sum of its proper divisors (1207855800).

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

664923888 is a wasteful number, since it uses less digits than its factorization.

664923888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29582 (or 29573 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 664923888 is about 25786.1181258444. The cubic root of 664923888 is about 872.8185717459.

The spelling of 664923888 in words is "six hundred sixty-four million, nine hundred twenty-three thousand, eight hundred eighty-eight".