256733 has 4 divisors (see below), whose sum is σ = 258720. Its totient is φ = 254748.

The previous prime is 256723. The next prime is 256757. The reversal of 256733 is 337652.

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 256733 - 2¹⁰ = 255709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785 + ... + 1062.

It is an arithmetic number, because the mean of its divisors is an integer number (64680).

2²⁵⁶⁷³³ is an apocalyptic number.

It is an amenable number.

256733 is a deficient number, since it is larger than the sum of its proper divisors (1987).

256733 is a wasteful number, since it uses less digits than its factorization.

256733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its digits is 3780, while the sum is 26.

The square root of 256733 is about 506.6882670834. The cubic root of 256733 is about 63.5565866723.

It can be divided in two parts, 256 and 733, that added together give a palindrome (989).

The spelling of 256733 in words is "two hundred fifty-six thousand, seven hundred thirty-three".