668646038 has 8 divisors (see below), whose sum is σ = 1008767088. Its totient is φ = 332390344.

The previous prime is 668646031. The next prime is 668646047. The reversal of 668646038 is 830646866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 668645983 and 668646001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668646031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965906 + ... + 966597.

It is an arithmetic number, because the mean of its divisors is an integer number (126095886).

Almost surely, 2^668646038 is an apocalyptic number.

668646038 is a deficient number, since it is larger than the sum of its proper divisors (340121050).

668646038 is a wasteful number, since it uses less digits than its factorization.

668646038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932678.

The product of its (nonzero) digits is 995328, while the sum is 47.

The square root of 668646038 is about 25858.1909266677. The cubic root of 668646038 is about 874.4441805569. Note that the first 3 decimals are identical.

The spelling of 668646038 in words is "six hundred sixty-eight million, six hundred forty-six thousand, thirty-eight".