668491932 has 72 divisors (see below), whose sum is σ = 1624741888. Its totient is φ = 213796800.

The previous prime is 668491931. The next prime is 668491937. The reversal of 668491932 is 239194866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668491931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5263653 + ... + 5263779.

Almost surely, 2^668491932 is an apocalyptic number.

It is an amenable number.

668491932 is an abundant number, since it is smaller than the sum of its proper divisors (956249956).

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

668491932 is a wasteful number, since it uses less digits than its factorization.

668491932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 276 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

The square root of 668491932 is about 25855.2109254595. The cubic root of 668491932 is about 874.3769963063.

The spelling of 668491932 in words is "six hundred sixty-eight million, four hundred ninety-one thousand, nine hundred thirty-two".