673 has 2 divisors, whose sum is σ = 674. Its totient is φ = 672.

The previous prime is 661. The next prime is 677. The reversal of 673 is 376.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529 + 144 = 23^2 + 12^2 .

673 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 673 - 2^{5} = 641 is a prime.

It is an Ulam number.

673 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336 + 337.

It is an arithmetic number, because the mean of its divisors is an integer number (337).

It is a Proth number, since it is equal to 21 ⋅ 2^{5} + 1 and 21 < 2^{5}.

It is an amenable number.

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

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

673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 16.

The square root of 673 is about 25.9422435421. The cubic root of 673 is about 8.7633808875.

The spelling of 673 in words is "six hundred seventy-three", and thus it is an aban number and an oban number.

• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.062 sec. • engine limits •