256637467 has 4 divisors (see below), whose sum is σ = 259036056. Its totient is φ = 254238880.

The previous prime is 256637449. The next prime is 256637471. The reversal of 256637467 is 764736652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256637467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256637477) 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, 1199134 + ... + 1199347.

It is an arithmetic number, because the mean of its divisors is an integer number (64759014).

Almost surely, 2^256637467 is an apocalyptic number.

256637467 is a deficient number, since it is larger than the sum of its proper divisors (2398589).

256637467 is a wasteful number, since it uses less digits than its factorization.

256637467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398588.

The product of its digits is 1270080, while the sum is 46.

The square root of 256637467 is about 16019.9084579157. The cubic root of 256637467 is about 635.4870234022.

The spelling of 256637467 in words is "two hundred fifty-six million, six hundred thirty-seven thousand, four hundred sixty-seven".