664661592 has 192 divisors, whose sum is σ = 2166720000. Its totient is φ = 184928832.

The previous prime is 664661587. The next prime is 664661611. The reversal of 664661592 is 295166466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3339909 + ... + 3340107.

It is an arithmetic number, because the mean of its divisors is an integer number (11285000).

Almost surely, 2^664661592 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 664661592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083360000).

664661592 is an abundant number, since it is smaller than the sum of its proper divisors (1502058408).

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

664661592 is a wasteful number, since it uses less digits than its factorization.

664661592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 258 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 664661592 is about 25781.0316318025. The cubic root of 664661592 is about 872.7037882175.

The spelling of 664661592 in words is "six hundred sixty-four million, six hundred sixty-one thousand, five hundred ninety-two".