256308475 has 12 divisors (see below), whose sum is σ = 322178536. Its totient is φ = 202236480.

The previous prime is 256308419. The next prime is 256308497. The reversal of 256308475 is 574803652.

It is not a de Polignac number, because 256308475 - 2¹⁹ = 255784187 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68397 + ... + 72046.

Almost surely, 2^256308475 is an apocalyptic number.

256308475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256308475 is a deficient number, since it is larger than the sum of its proper divisors (65870061).

256308475 is a wasteful number, since it uses less digits than its factorization.

256308475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140526 (or 140521 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 256308475 is about 16009.6369415424. The cubic root of 256308475 is about 635.2153567189.

The spelling of 256308475 in words is "two hundred fifty-six million, three hundred eight thousand, four hundred seventy-five".