668245730 has 16 divisors (see below), whose sum is σ = 1225538424. Its totient is φ = 262254720.

The previous prime is 668245717. The next prime is 668245733. The reversal of 668245730 is 37542866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 655206409 + 13039321 = 25597^2 + 3611^2 .

It is not an unprimeable number, because it can be changed into a prime (668245733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629891 + ... + 630950.

Almost surely, 2^668245730 is an apocalyptic number.

668245730 is a deficient number, since it is larger than the sum of its proper divisors (557292694).

668245730 is a wasteful number, since it uses less digits than its factorization.

668245730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260901.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 668245730 is about 25850.4493191124. The cubic root of 668245730 is about 874.2696403367.

The spelling of 668245730 in words is "six hundred sixty-eight million, two hundred forty-five thousand, seven hundred thirty".