256633 has 8 divisors (see below), whose sum is σ = 291200. Its totient is φ = 224208.

The previous prime is 256609. The next prime is 256639. The reversal of 256633 is 336652.

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

It is a cyclic number.

It is not a de Polignac number, because 256633 - 2⁹ = 256121 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 5⁷ + 6 + 6⁴ + 3³ + 3¹¹ .

It is a junction number, because it is equal to n+sod(n) for n = 256598 and 256607.

It is not an unprimeable number, because it can be changed into a prime (256639) 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, 273 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (36400).

2²⁵⁶⁶³³ is an apocalyptic number.

It is an amenable number.

256633 is a deficient number, since it is larger than the sum of its proper divisors (34567).

256633 is a wasteful number, since it uses less digits than its factorization.

256633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071.

The product of its digits is 3240, while the sum is 25.

The square root of 256633 is about 506.5895774688. The cubic root of 256633 is about 63.5483336311.

The spelling of 256633 in words is "two hundred fifty-six thousand, six hundred thirty-three".