256477 has 8 divisors (see below), whose sum is σ = 280280. Its totient is φ = 233280.

The previous prime is 256471. The next prime is 256483. The reversal of 256477 is 774652.

It is an interprime number because it is at equal distance from previous prime (256471) and next prime (256483).

It can be written as a sum of positive squares in 4 ways, for example, as 441 + 256036 = 21^2 + 506^2 .

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 256477 - 2³ = 256469 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256471) 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, 1327 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (35035).

2²⁵⁶⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

256477 is a deficient number, since it is larger than the sum of its proper divisors (23803).

256477 is a wasteful number, since it uses less digits than its factorization.

256477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303.

The product of its digits is 11760, while the sum is 31.

The square root of 256477 is about 506.4355832680. The cubic root of 256477 is about 63.5354546049.

The spelling of 256477 in words is "two hundred fifty-six thousand, four hundred seventy-seven".