668947402 has 16 divisors (see below), whose sum is σ = 1062079200. Its totient is φ = 315115920.

The previous prime is 668947393. The next prime is 668947403. The reversal of 668947402 is 204749866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (668947403) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41752 + ... + 55507.

It is an arithmetic number, because the mean of its divisors is an integer number (66379950).

Almost surely, 2^668947402 is an apocalyptic number.

668947402 is a deficient number, since it is larger than the sum of its proper divisors (393131798).

668947402 is a wasteful number, since it uses less digits than its factorization.

668947402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97461.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 668947402 is about 25864.0175146863. The cubic root of 668947402 is about 874.5755337692.

The spelling of 668947402 in words is "six hundred sixty-eight million, nine hundred forty-seven thousand, four hundred two".