668767 has 6 divisors (see below), whose sum is σ = 735224. Its totient is φ = 607860.

The previous prime is 668761. The next prime is 668791. The reversal of 668767 is 767866.

It is not a de Polignac number, because 668767 - 2¹⁹ = 144479 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 (668761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2643 + ... + 2884.

2⁶⁶⁸⁷⁶⁷ is an apocalyptic number.

668767 is a deficient number, since it is larger than the sum of its proper divisors (66457).

668767 is a wasteful number, since it uses less digits than its factorization.

668767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5549 (or 5538 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 668767 is about 817.7817557270. The cubic root of 668767 is about 87.4496908076.

Subtracting 668767 from its reverse (767866), we obtain a palindrome (99099).

The spelling of 668767 in words is "six hundred sixty-eight thousand, seven hundred sixty-seven".