673691 has 4 divisors (see below), whose sum is σ = 675384. Its totient is φ = 672000.

The previous prime is 673669. The next prime is 673747. The reversal of 673691 is 196376.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 673691 - 2¹⁰ = 672667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673091) 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, 116 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (168846).

2⁶⁷³⁶⁹¹ is an apocalyptic number.

673691 is a deficient number, since it is larger than the sum of its proper divisors (1693).

673691 is a wasteful number, since it uses less digits than its factorization.

673691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692.

The product of its digits is 6804, while the sum is 32.

The square root of 673691 is about 820.7868176329. The cubic root of 673691 is about 87.6637911673.

The spelling of 673691 in words is "six hundred seventy-three thousand, six hundred ninety-one".