668822438 has 8 divisors (see below), whose sum is σ = 1007615280. Its totient is φ = 332950680.

The previous prime is 668822419. The next prime is 668822459. The reversal of 668822438 is 834228866.

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 = 668822392 and 668822401.

It is a congruent number.

It is an unprimeable number.

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, 729698 + ... + 730613.

It is an arithmetic number, because the mean of its divisors is an integer number (125951910).

Almost surely, 2^668822438 is an apocalyptic number.

668822438 is a deficient number, since it is larger than the sum of its proper divisors (338792842).

668822438 is a wasteful number, since it uses less digits than its factorization.

668822438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460542.

The product of its digits is 884736, while the sum is 47.

The square root of 668822438 is about 25861.6016132025. The cubic root of 668822438 is about 874.5210714588.

The spelling of 668822438 in words is "six hundred sixty-eight million, eight hundred twenty-two thousand, four hundred thirty-eight".