256673 has 4 divisors (see below), whose sum is σ = 258048. Its totient is φ = 255300.

The previous prime is 256661. The next prime is 256687. The reversal of 256673 is 376652.

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 256673 - 2⁶ = 256609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353 + ... + 798.

It is an arithmetic number, because the mean of its divisors is an integer number (64512).

2²⁵⁶⁶⁷³ is an apocalyptic number.

It is an amenable number.

256673 is a deficient number, since it is larger than the sum of its proper divisors (1375).

256673 is a wasteful number, since it uses less digits than its factorization.

256673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374.

The product of its digits is 7560, while the sum is 29.

The square root of 256673 is about 506.6290556216. The cubic root of 256673 is about 63.5516351048.

It can be divided in two parts, 256 and 673, that added together give a palindrome (929).

The spelling of 256673 in words is "two hundred fifty-six thousand, six hundred seventy-three".