668434408 has 16 divisors (see below), whose sum is σ = 1261299780. Its totient is φ = 332087808.

The previous prime is 668434387. The next prime is 668434409. The reversal of 668434408 is 804434866.

It can be written as a sum of positive squares in 2 ways, for example, as 636149284 + 32285124 = 25222^2 + 5682^2 .

It is not an unprimeable number, because it can be changed into a prime (668434409) 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, 264841 + ... + 267352.

Almost surely, 2^668434408 is an apocalyptic number.

It is an amenable number.

668434408 is a deficient number, since it is larger than the sum of its proper divisors (592865372).

668434408 is a wasteful number, since it uses less digits than its factorization.

668434408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532356 (or 532352 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The square root of 668434408 is about 25854.0984758703. The cubic root of 668434408 is about 874.3519154227.

The spelling of 668434408 in words is "six hundred sixty-eight million, four hundred thirty-four thousand, four hundred eight".