664024660 has 72 divisors (see below), whose sum is σ = 1531789056. Its totient is φ = 241637760.

The previous prime is 664024591. The next prime is 664024693. The reversal of 664024660 is 66420466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238597 + ... + 241363.

It is an arithmetic number, because the mean of its divisors is an integer number (21274848).

Almost surely, 2^664024660 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 664024660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765894528).

664024660 is an abundant number, since it is smaller than the sum of its proper divisors (867764396).

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

664024660 is a wasteful number, since it uses less digits than its factorization.

664024660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 664024660 is about 25768.6759458068. The cubic root of 664024660 is about 872.4249342238.

The spelling of 664024660 in words is "six hundred sixty-four million, twenty-four thousand, six hundred sixty".