668468308 has 12 divisors (see below), whose sum is σ = 1174373172. Its totient is φ = 332933120.

The previous prime is 668468303. The next prime is 668468309. The reversal of 668468308 is 803864866.

It can be written as a sum of positive squares in 2 ways, for example, as 662650564 + 5817744 = 25742^2 + 2412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668468303) 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, 324103 + ... + 326158.

It is an arithmetic number, because the mean of its divisors is an integer number (97864431).

Almost surely, 2^668468308 is an apocalyptic number.

It is an amenable number.

668468308 is a deficient number, since it is larger than the sum of its proper divisors (505904864).

668468308 is a wasteful number, since it uses less digits than its factorization.

668468308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650522 (or 650520 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 668468308 is about 25854.7540696097. The cubic root of 668468308 is about 874.3666962441.

The spelling of 668468308 in words is "six hundred sixty-eight million, four hundred sixty-eight thousand, three hundred eight".