668743 has 8 divisors (see below), whose sum is σ = 716720. Its totient is φ = 622080.

The previous prime is 668741. The next prime is 668747. The reversal of 668743 is 347866.

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 668743 - 2¹ = 668741 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 668699 and 668708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668741) 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, 871 + ... + 1447.

It is an arithmetic number, because the mean of its divisors is an integer number (89590).

2⁶⁶⁸⁷⁴³ is an apocalyptic number.

668743 is a deficient number, since it is larger than the sum of its proper divisors (47977).

668743 is a wasteful number, since it uses less digits than its factorization.

668743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657.

The product of its digits is 24192, while the sum is 34.

The square root of 668743 is about 817.7670817537. The cubic root of 668743 is about 87.4486446945.

The spelling of 668743 in words is "six hundred sixty-eight thousand, seven hundred forty-three".