673657 has 4 divisors (see below), whose sum is σ = 677376. Its totient is φ = 669940.

The previous prime is 673649. The next prime is 673667. The reversal of 673657 is 756376.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 673657 - 2³ = 673649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673637) 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, 1573 + ... + 1954.

It is an arithmetic number, because the mean of its divisors is an integer number (169344).

2⁶⁷³⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

673657 is a deficient number, since it is larger than the sum of its proper divisors (3719).

673657 is a wasteful number, since it uses less digits than its factorization.

673657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718.

The product of its digits is 26460, while the sum is 34.

The square root of 673657 is about 820.7661055380. The cubic root of 673657 is about 87.6623163967.

The spelling of 673657 in words is "six hundred seventy-three thousand, six hundred fifty-seven".