256758947 has 8 divisors (see below), whose sum is σ = 264127056. Its totient is φ = 249413472.

The previous prime is 256758893. The next prime is 256758967. The reversal of 256758947 is 749857652.

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

It is a cyclic number.

It is not a de Polignac number, because 256758947 - 2⁶ = 256758883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256758967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18848 + ... + 29474.

It is an arithmetic number, because the mean of its divisors is an integer number (33015882).

Almost surely, 2^256758947 is an apocalyptic number.

256758947 is a deficient number, since it is larger than the sum of its proper divisors (7368109).

256758947 is a wasteful number, since it uses less digits than its factorization.

256758947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11317.

The product of its digits is 4233600, while the sum is 53.

The square root of 256758947 is about 16023.6995416165. The cubic root of 256758947 is about 635.5872773869.

The spelling of 256758947 in words is "two hundred fifty-six million, seven hundred fifty-eight thousand, nine hundred forty-seven".