668239232 has 64 divisors (see below), whose sum is σ = 1367893440. Its totient is φ = 325017600.

The previous prime is 668239219. The next prime is 668239241. The reversal of 668239232 is 232932866.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 668239232.

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, 1666232 + ... + 1666632.

It is an arithmetic number, because the mean of its divisors is an integer number (21373335).

Almost surely, 2^668239232 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 668239232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683946720).

668239232 is an abundant number, since it is smaller than the sum of its proper divisors (699654208).

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

668239232 is a wasteful number, since it uses less digits than its factorization.

668239232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 727 counting only the distinct ones).

The product of its digits is 186624, while the sum is 41.

The square root of 668239232 is about 25850.3236343377. The cubic root of 668239232 is about 874.2668065375.

The spelling of 668239232 in words is "six hundred sixty-eight million, two hundred thirty-nine thousand, two hundred thirty-two".