668759 has 8 divisors (see below), whose sum is σ = 823200. Its totient is φ = 529056.

The previous prime is 668747. The next prime is 668761. The reversal of 668759 is 957866.

668759 = T₉₀ + T₉₁ + ... + T₁₆₇.

It is a happy number.

668759 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 668759 - 2¹² = 664663 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668759.

It is not an unprimeable number, because it can be changed into a prime (668719) 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, 3584 + ... + 3765.

It is an arithmetic number, because the mean of its divisors is an integer number (102900).

2⁶⁶⁸⁷⁵⁹ is an apocalyptic number.

668759 is a deficient number, since it is larger than the sum of its proper divisors (154441).

668759 is a wasteful number, since it uses less digits than its factorization.

668759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7369.

The product of its digits is 90720, while the sum is 41.

The square root of 668759 is about 817.7768644319. The cubic root of 668759 is about 87.4493421060.

The spelling of 668759 in words is "six hundred sixty-eight thousand, seven hundred fifty-nine".