664240524 has 24 divisors (see below), whose sum is σ = 1641065328. Its totient is φ = 208389120.

The previous prime is 664240523. The next prime is 664240531. The reversal of 664240524 is 425042466.

It is not an unprimeable number, because it can be changed into a prime (664240523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1627837 + ... + 1628244.

It is an arithmetic number, because the mean of its divisors is an integer number (68377722).

Almost surely, 2^664240524 is an apocalyptic number.

It is an amenable number.

664240524 is an abundant number, since it is smaller than the sum of its proper divisors (976824804).

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

664240524 is a wasteful number, since it uses less digits than its factorization.

664240524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3256105 (or 3256103 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 664240524 is about 25772.8641016089. The cubic root of 664240524 is about 872.5194612014.

The spelling of 664240524 in words is "six hundred sixty-four million, two hundred forty thousand, five hundred twenty-four".