256533 has 8 divisors (see below), whose sum is σ = 344448. Its totient is φ = 169824.

The previous prime is 256517. The next prime is 256541. The reversal of 256533 is 335652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256533 - 2⁴ = 256517 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 882.

It is an arithmetic number, because the mean of its divisors is an integer number (43056).

2²⁵⁶⁵³³ is an apocalyptic number.

It is an amenable number.

256533 is a deficient number, since it is larger than the sum of its proper divisors (87915).

256533 is a wasteful number, since it uses less digits than its factorization.

256533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603.

The product of its digits is 2700, while the sum is 24.

The square root of 256533 is about 506.4908686245. The cubic root of 256533 is about 63.5400784458.

The spelling of 256533 in words is "two hundred fifty-six thousand, five hundred thirty-three".