668893 has 4 divisors (see below), whose sum is σ = 677440. Its totient is φ = 660348.

The previous prime is 668879. The next prime is 668903. The reversal of 668893 is 398866.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668893 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 (668803) 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 3 ways as a sum of consecutive naturals, for example, 4155 + ... + 4312.

It is an arithmetic number, because the mean of its divisors is an integer number (169360).

2⁶⁶⁸⁸⁹³ is an apocalyptic number.

It is an amenable number.

668893 is a deficient number, since it is larger than the sum of its proper divisors (8547).

668893 is an equidigital number, since it uses as much as digits as its factorization.

668893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8546.

The product of its digits is 62208, while the sum is 40.

The square root of 668893 is about 817.8587897675. The cubic root of 668893 is about 87.4551824906.

The spelling of 668893 in words is "six hundred sixty-eight thousand, eight hundred ninety-three".