668692732 has 12 divisors (see below), whose sum is σ = 1192292136. Its totient is φ = 328037840.

The previous prime is 668692711. The next prime is 668692733. The reversal of 668692732 is 237296866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668692733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576894 + ... + 1577317.

It is an arithmetic number, because the mean of its divisors is an integer number (99357678).

Almost surely, 2^668692732 is an apocalyptic number.

It is an amenable number.

668692732 is a deficient number, since it is larger than the sum of its proper divisors (523599404).

668692732 is a wasteful number, since it uses less digits than its factorization.

668692732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3154268 (or 3154266 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 668692732 is about 25859.0937969605. The cubic root of 668692732 is about 874.4645352956.

The spelling of 668692732 in words is "six hundred sixty-eight million, six hundred ninety-two thousand, seven hundred thirty-two".