668288389 has 4 divisors (see below), whose sum is σ = 668350720. Its totient is φ = 668226060.

The previous prime is 668288363. The next prime is 668288399. The reversal of 668288389 is 983882866.

668288389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 668288389 - 2²¹ = 666191237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668288399) 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, 10527 + ... + 38044.

It is an arithmetic number, because the mean of its divisors is an integer number (167087680).

Almost surely, 2^668288389 is an apocalyptic number.

It is an amenable number.

668288389 is a deficient number, since it is larger than the sum of its proper divisors (62331).

668288389 is a wasteful number, since it uses less digits than its factorization.

668288389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62330.

The product of its digits is 7962624, while the sum is 58.

The square root of 668288389 is about 25851.2744173281. The cubic root of 668288389 is about 874.2882436106.

The spelling of 668288389 in words is "six hundred sixty-eight million, two hundred eighty-eight thousand, three hundred eighty-nine".