256654 has 4 divisors (see below), whose sum is σ = 384984. Its totient is φ = 128326.

The previous prime is 256651. The next prime is 256661. The reversal of 256654 is 456652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64162 + ... + 64165.

It is an arithmetic number, because the mean of its divisors is an integer number (96246).

2²⁵⁶⁶⁵⁴ is an apocalyptic number.

256654 is a deficient number, since it is larger than the sum of its proper divisors (128330).

256654 is a wasteful number, since it uses less digits than its factorization.

256654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128329.

The product of its digits is 7200, while the sum is 28.

The square root of 256654 is about 506.6103038826. The cubic root of 256654 is about 63.5500669476.

The spelling of 256654 in words is "two hundred fifty-six thousand, six hundred fifty-four".