256464263 has 4 divisors (see below), whose sum is σ = 279779208. Its totient is φ = 233149320.

The previous prime is 256464259. The next prime is 256464277. The reversal of 256464263 is 362464652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256464263 - 2² = 256464259 is a prime.

It is a super-2 number, since 2×256464263² = 131547836392266338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256464233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11657456 + ... + 11657477.

It is an arithmetic number, because the mean of its divisors is an integer number (69944802).

Almost surely, 2^256464263 is an apocalyptic number.

256464263 is a deficient number, since it is larger than the sum of its proper divisors (23314945).

256464263 is a wasteful number, since it uses less digits than its factorization.

256464263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23314944.

The product of its digits is 207360, while the sum is 38.

The square root of 256464263 is about 16014.5016469449. The cubic root of 256464263 is about 635.3440283481.

The spelling of 256464263 in words is "two hundred fifty-six million, four hundred sixty-four thousand, two hundred sixty-three".