256648 has 16 divisors (see below), whose sum is σ = 550080. Its totient is φ = 109968.

The previous prime is 256643. The next prime is 256651. The reversal of 256648 is 846652.

256648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (256643) by changing a digit.

256648 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2236 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (34380).

2²⁵⁶⁶⁴⁸ is an apocalyptic number.

256648 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

256648 is an abundant number, since it is smaller than the sum of its proper divisors (293432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256648 is a wasteful number, since it uses less digits than its factorization.

256648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4596 (or 4592 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 256648 is about 506.6043821366. The cubic root of 256648 is about 63.5495717240.

The spelling of 256648 in words is "two hundred fifty-six thousand, six hundred forty-eight".