667759 has 4 divisors (see below), whose sum is σ = 696816. Its totient is φ = 638704.

The previous prime is 667753. The next prime is 667769. The reversal of 667759 is 957766.

667759 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.

It is a cyclic number.

It is not a de Polignac number, because 667759 - 2⁵ = 667727 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 (667753) 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, 14494 + ... + 14539.

It is an arithmetic number, because the mean of its divisors is an integer number (174204).

2⁶⁶⁷⁷⁵⁹ is an apocalyptic number.

667759 is a deficient number, since it is larger than the sum of its proper divisors (29057).

667759 is a wasteful number, since it uses less digits than its factorization.

667759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29056.

The product of its digits is 79380, while the sum is 40.

The square root of 667759 is about 817.1652219717. The cubic root of 667759 is about 87.4057324916.

The spelling of 667759 in words is "six hundred sixty-seven thousand, seven hundred fifty-nine".