668867238 has 48 divisors (see below), whose sum is σ = 1562739360. Its totient is φ = 205535232.

The previous prime is 668867237. The next prime is 668867249. The reversal of 668867238 is 832768866.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668867237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 247398 + ... + 250086.

It is an arithmetic number, because the mean of its divisors is an integer number (32557070).

Almost surely, 2^668867238 is an apocalyptic number.

668867238 is an abundant number, since it is smaller than the sum of its proper divisors (893872122).

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

668867238 is a wasteful number, since it uses less digits than its factorization.

668867238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773 (or 3770 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 668867238 is about 25862.4677476841. The cubic root of 668867238 is about 874.5405971540.

The spelling of 668867238 in words is "six hundred sixty-eight million, eight hundred sixty-seven thousand, two hundred thirty-eight".