256487 has 8 divisors (see below), whose sum is σ = 319872. Its totient is φ = 199800.

The previous prime is 256483. The next prime is 256489. The reversal of 256487 is 784652.

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 256487 - 2² = 256483 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256487.

It is not an unprimeable number, because it can be changed into a prime (256483) 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 7 ways as a sum of consecutive naturals, for example, 1589 + ... + 1742.

It is an arithmetic number, because the mean of its divisors is an integer number (39984).

2²⁵⁶⁴⁸⁷ is an apocalyptic number.

256487 is a deficient number, since it is larger than the sum of its proper divisors (63385).

256487 is a wasteful number, since it uses less digits than its factorization.

256487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349.

The product of its digits is 13440, while the sum is 32.

The square root of 256487 is about 506.4454560957. The cubic root of 256487 is about 63.5362803401.

The spelling of 256487 in words is "two hundred fifty-six thousand, four hundred eighty-seven".