668637727 has 8 divisors (see below), whose sum is σ = 708247152. Its totient is φ = 629059200.

The previous prime is 668637713. The next prime is 668637731. The reversal of 668637727 is 727736866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668637727 - 2²⁷ = 534419999 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 (668637527) 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, 48652 + ... + 60862.

It is an arithmetic number, because the mean of its divisors is an integer number (88530894).

Almost surely, 2^668637727 is an apocalyptic number.

668637727 is a deficient number, since it is larger than the sum of its proper divisors (39609425).

668637727 is a wasteful number, since it uses less digits than its factorization.

668637727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15449.

The product of its digits is 3556224, while the sum is 52.

The square root of 668637727 is about 25858.0302227374. The cubic root of 668637727 is about 874.4405575460.

The spelling of 668637727 in words is "six hundred sixty-eight million, six hundred thirty-seven thousand, seven hundred twenty-seven".