256413686 has 8 divisors (see below), whose sum is σ = 407245320. Its totient is φ = 120665248.

The previous prime is 256413667. The next prime is 256413701. The reversal of 256413686 is 686314652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 3770756 + ... + 3770823.

It is an arithmetic number, because the mean of its divisors is an integer number (50905665).

Almost surely, 2^256413686 is an apocalyptic number.

256413686 is a deficient number, since it is larger than the sum of its proper divisors (150831634).

256413686 is a wasteful number, since it uses less digits than its factorization.

256413686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7541598.

The product of its digits is 207360, while the sum is 41.

The square root of 256413686 is about 16012.9224690560. The cubic root of 256413686 is about 635.3022604658.

The spelling of 256413686 in words is "two hundred fifty-six million, four hundred thirteen thousand, six hundred eighty-six".