256611678 has 16 divisors (see below), whose sum is σ = 514076160. Its totient is φ = 85395096.

The previous prime is 256611643. The next prime is 256611697. The reversal of 256611678 is 876116652.

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 7 ways as a sum of consecutive naturals, for example, 31588 + ... + 38871.

It is an arithmetic number, because the mean of its divisors is an integer number (32129760).

Almost surely, 2^256611678 is an apocalyptic number.

256611678 is an abundant number, since it is smaller than the sum of its proper divisors (257464482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256611678 is a wasteful number, since it uses less digits than its factorization.

256611678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71071.

The product of its digits is 120960, while the sum is 42.

The square root of 256611678 is about 16019.1035329696. The cubic root of 256611678 is about 635.4657364041.

The spelling of 256611678 in words is "two hundred fifty-six million, six hundred eleven thousand, six hundred seventy-eight".