668678238 has 48 divisors (see below), whose sum is σ = 1536621840. Its totient is φ = 209426688.

The previous prime is 668678233. The next prime is 668678243. The reversal of 668678238 is 832876866.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (668678233) and next prime (668678243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668678233) 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, 224656 + ... + 227612.

It is an arithmetic number, because the mean of its divisors is an integer number (32012955).

Almost surely, 2^668678238 is an apocalyptic number.

668678238 is an abundant number, since it is smaller than the sum of its proper divisors (867943602).

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

668678238 is a wasteful number, since it uses less digits than its factorization.

668678238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721 (or 3718 counting only the distinct ones).

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

The square root of 668678238 is about 25858.8135458687. The cubic root of 668678238 is about 874.4582172066.

The spelling of 668678238 in words is "six hundred sixty-eight million, six hundred seventy-eight thousand, two hundred thirty-eight".