256988 has 12 divisors (see below), whose sum is σ = 460992. Its totient is φ = 125280.

The previous prime is 256981. The next prime is 257003. The reversal of 256988 is 889652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256981) by changing a digit.

256988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 620 + ... + 947.

It is an arithmetic number, because the mean of its divisors is an integer number (38416).

2²⁵⁶⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

256988 is a deficient number, since it is larger than the sum of its proper divisors (204004).

256988 is a wasteful number, since it uses less digits than its factorization.

256988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 1610 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 256988 is about 506.9398386397. The cubic root of 256988 is about 63.5776222316.

The spelling of 256988 in words is "two hundred fifty-six thousand, nine hundred eighty-eight".