664097632 has 48 divisors (see below), whose sum is σ = 1453252752. Its totient is φ = 296158720.

The previous prime is 664097627. The next prime is 664097647. The reversal of 664097632 is 236790466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858 + ... + 36454.

It is an arithmetic number, because the mean of its divisors is an integer number (30276099).

Almost surely, 2^664097632 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 664097632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726626376).

664097632 is an abundant number, since it is smaller than the sum of its proper divisors (789155120).

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

664097632 is a wasteful number, since it uses less digits than its factorization.

664097632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35671 (or 35663 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 664097632 is about 25770.0918120212. The cubic root of 664097632 is about 872.4568909990.

The spelling of 664097632 in words is "six hundred sixty-four million, ninety-seven thousand, six hundred thirty-two".