256488693 has 8 divisors (see below), whose sum is σ = 342700800. Its totient is φ = 170634528.

The previous prime is 256488691. The next prime is 256488703. The reversal of 256488693 is 396884652.

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

It is not a de Polignac number, because 256488693 - 2¹ = 256488691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256488691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87808 + ... + 90681.

It is an arithmetic number, because the mean of its divisors is an integer number (42837600).

Almost surely, 2^256488693 is an apocalyptic number.

It is an amenable number.

256488693 is a deficient number, since it is larger than the sum of its proper divisors (86212107).

256488693 is a wasteful number, since it uses less digits than its factorization.

256488693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178971.

The product of its digits is 2488320, while the sum is 51.

The square root of 256488693 is about 16015.2643749643. The cubic root of 256488693 is about 635.3642013495.

The spelling of 256488693 in words is "two hundred fifty-six million, four hundred eighty-eight thousand, six hundred ninety-three".