667673 has 2 divisors, whose sum is σ = 667674. Its totient is φ = 667672.

The previous prime is 667657. The next prime is 667687. The reversal of 667673 is 376766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444889 + 222784 = 667^2 + 472^2 .

It is a cyclic number.

It is not a de Polignac number, because 667673 - 2⁴ = 667657 is a prime.

It is a plaindrome in base 9.

It is not a weakly prime, because it can be changed into another prime (667643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333836 + 333837.

It is an arithmetic number, because the mean of its divisors is an integer number (333837).

2⁶⁶⁷⁶⁷³ is an apocalyptic number.

It is an amenable number.

667673 is a deficient number, since it is larger than the sum of its proper divisors (1).

667673 is an equidigital number, since it uses as much as digits as its factorization.

667673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 35.

The square root of 667673 is about 817.1125993399. The cubic root of 667673 is about 87.4019800322.

The spelling of 667673 in words is "six hundred sixty-seven thousand, six hundred seventy-three".