256469915 has 32 divisors (see below), whose sum is σ = 341288640. Its totient is φ = 183845376.

The previous prime is 256469911. The next prime is 256469953. The reversal of 256469915 is 519964652.

It is not a de Polignac number, because 256469915 - 2² = 256469911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256469915.

It is not an unprimeable number, because it can be changed into a prime (256469911) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 375164 + ... + 375846.

It is an arithmetic number, because the mean of its divisors is an integer number (10665270).

Almost surely, 2^256469915 is an apocalyptic number.

256469915 is a deficient number, since it is larger than the sum of its proper divisors (84818725).

256469915 is a wasteful number, since it uses less digits than its factorization.

256469915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863.

The product of its digits is 583200, while the sum is 47.

The square root of 256469915 is about 16014.6781110330. The cubic root of 256469915 is about 635.3486955846.

The spelling of 256469915 in words is "two hundred fifty-six million, four hundred sixty-nine thousand, nine hundred fifteen".