256432855 has 16 divisors (see below), whose sum is σ = 354911040. Its totient is φ = 174223872.

The previous prime is 256432849. The next prime is 256432861. The reversal of 256432855 is 558234652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256432849) and next prime (256432861).

It is a cyclic number.

It is not a de Polignac number, because 256432855 - 2¹⁹ = 255908567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29794 + ... + 37423.

It is an arithmetic number, because the mean of its divisors is an integer number (22181940).

Almost surely, 2^256432855 is an apocalyptic number.

256432855 is a deficient number, since it is larger than the sum of its proper divisors (98478185).

256432855 is a wasteful number, since it uses less digits than its factorization.

256432855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67338.

The product of its digits is 288000, while the sum is 40.

The square root of 256432855 is about 16013.5210057002. The cubic root of 256432855 is about 635.3180914013.

The spelling of 256432855 in words is "two hundred fifty-six million, four hundred thirty-two thousand, eight hundred fifty-five".