664045660 has 24 divisors (see below), whose sum is σ = 1432186560. Its totient is φ = 258439104.

The previous prime is 664045631. The next prime is 664045667. The reversal of 664045660 is 66540466.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664045667) 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, 447940 + ... + 449419.

It is an arithmetic number, because the mean of its divisors is an integer number (59674440).

Almost surely, 2^664045660 is an apocalyptic number.

It is an amenable number.

664045660 is an abundant number, since it is smaller than the sum of its proper divisors (768140900).

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

664045660 is a wasteful number, since it uses less digits than its factorization.

664045660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897405 (or 897403 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 664045660 is about 25769.0834140448. The cubic root of 664045660 is about 872.4341310361.

The spelling of 664045660 in words is "six hundred sixty-four million, forty-five thousand, six hundred sixty".