238668666 has 32 divisors (see below), whose sum is σ = 495469440. Its totient is φ = 76552896.

The previous prime is 238668643. The next prime is 238668697. The reversal of 238668666 is 666866832.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 52995 + ... + 57321.

It is an arithmetic number, because the mean of its divisors is an integer number (15483420).

Almost surely, 2^238668666 is an apocalyptic number.

238668666 is an abundant number, since it is smaller than the sum of its proper divisors (256800774).

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

238668666 is a wasteful number, since it uses less digits than its factorization.

238668666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4678.

The product of its digits is 2985984, while the sum is 51.

The square root of 238668666 is about 15448.9050097410. The cubic root of 238668666 is about 620.2952686549.

The spelling of 238668666 in words is "two hundred thirty-eight million, six hundred sixty-eight thousand, six hundred sixty-six".