256506895 has 8 divisors (see below), whose sum is σ = 308453760. Its totient is φ = 204775200.

The previous prime is 256506857. The next prime is 256506923. The reversal of 256506895 is 598605652.

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

It is not a de Polignac number, because 256506895 - 2¹⁹ = 255982607 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 7 ways as a sum of consecutive naturals, for example, 51156 + ... + 55945.

It is an arithmetic number, because the mean of its divisors is an integer number (38556720).

Almost surely, 2^256506895 is an apocalyptic number.

256506895 is a deficient number, since it is larger than the sum of its proper divisors (51946865).

256506895 is a wasteful number, since it uses less digits than its factorization.

256506895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107585.

The product of its (nonzero) digits is 648000, while the sum is 46.

The square root of 256506895 is about 16015.8326352394. The cubic root of 256506895 is about 635.3792307653.

The spelling of 256506895 in words is "two hundred fifty-six million, five hundred six thousand, eight hundred ninety-five".