664875920 has 40 divisors (see below), whose sum is σ = 1556983680. Its totient is φ = 264032640.

The previous prime is 664875901. The next prime is 664875923. The reversal of 664875920 is 29578466.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (664875923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18776 + ... + 41015.

It is an arithmetic number, because the mean of its divisors is an integer number (38924592).

Almost surely, 2^664875920 is an apocalyptic number.

It is an amenable number.

664875920 is an abundant number, since it is smaller than the sum of its proper divisors (892107760).

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

664875920 is a wasteful number, since it uses less digits than its factorization.

664875920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59943 (or 59937 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 664875920 is about 25785.1879962121. The cubic root of 664875920 is about 872.7975826930.

The spelling of 664875920 in words is "six hundred sixty-four million, eight hundred seventy-five thousand, nine hundred twenty".