668389574 has 16 divisors (see below), whose sum is σ = 1036262400. Its totient is φ = 322996680.

The previous prime is 668389573. The next prime is 668389577. The reversal of 668389574 is 475983866.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668389573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44477 + ... + 57575.

It is an arithmetic number, because the mean of its divisors is an integer number (64766400).

Almost surely, 2^668389574 is an apocalyptic number.

668389574 is a deficient number, since it is larger than the sum of its proper divisors (367872826).

668389574 is a wasteful number, since it uses less digits than its factorization.

668389574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13955.

The product of its digits is 8709120, while the sum is 56.

The square root of 668389574 is about 25853.2314034436. The cubic root of 668389574 is about 874.3323664738.

The spelling of 668389574 in words is "six hundred sixty-eight million, three hundred eighty-nine thousand, five hundred seventy-four".