257745813 has 8 divisors (see below), whose sum is σ = 370096608. Its totient is φ = 158612784.

The previous prime is 257745809. The next prime is 257745871. The reversal of 257745813 is 318547752.

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

It is not a de Polignac number, because 257745813 - 2² = 257745809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257745113) 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, 3304395 + ... + 3304472.

It is an arithmetic number, because the mean of its divisors is an integer number (46262076).

Almost surely, 2^257745813 is an apocalyptic number.

It is an amenable number.

257745813 is a deficient number, since it is larger than the sum of its proper divisors (112350795).

257745813 is a wasteful number, since it uses less digits than its factorization.

257745813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608883.

The product of its digits is 235200, while the sum is 42.

The square root of 257745813 is about 16054.4639586627. The cubic root of 257745813 is about 636.4005402859.

The spelling of 257745813 in words is "two hundred fifty-seven million, seven hundred forty-five thousand, eight hundred thirteen".