668873 has 2 divisors, whose sum is σ = 668874. Its totient is φ = 668872.

The previous prime is 668869. The next prime is 668879. The reversal of 668873 is 378866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369664 + 299209 = 608^2 + 547^2 .

It is a cyclic number.

It is not a de Polignac number, because 668873 - 2² = 668869 is a prime.

It is not a weakly prime, because it can be changed into another prime (668879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334436 + 334437.

It is an arithmetic number, because the mean of its divisors is an integer number (334437).

2⁶⁶⁸⁸⁷³ is an apocalyptic number.

It is an amenable number.

668873 is a deficient number, since it is larger than the sum of its proper divisors (1).

668873 is an equidigital number, since it uses as much as digits as its factorization.

668873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 668873 is about 817.8465626265. The cubic root of 668873 is about 87.4543108409.

It can be divided in two parts, 66887 and 3, that multiplied together give a triangular number (200661 = T₆₃₃).

The spelling of 668873 in words is "six hundred sixty-eight thousand, eight hundred seventy-three".