256945694 has 4 divisors (see below), whose sum is σ = 385418544. Its totient is φ = 128472846.

The previous prime is 256945687. The next prime is 256945697. The reversal of 256945694 is 496549652.

It is a happy number.

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

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256945697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64236422 + ... + 64236425.

It is an arithmetic number, because the mean of its divisors is an integer number (96354636).

Almost surely, 2^256945694 is an apocalyptic number.

256945694 is a deficient number, since it is larger than the sum of its proper divisors (128472850).

256945694 is a wasteful number, since it uses less digits than its factorization.

256945694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128472849.

The product of its digits is 2332800, while the sum is 50.

The square root of 256945694 is about 16029.5256947921. The cubic root of 256945694 is about 635.7413327164.

The spelling of 256945694 in words is "two hundred fifty-six million, nine hundred forty-five thousand, six hundred ninety-four".