257868685 has 8 divisors (see below), whose sum is σ = 309538656. Its totient is φ = 206230800.

The previous prime is 257868679. The next prime is 257868707. The reversal of 257868685 is 586868752.

It is a happy number.

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

It is not a de Polignac number, because 257868685 - 2¹⁹ = 257344397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 16462 + ... + 28048.

It is an arithmetic number, because the mean of its divisors is an integer number (38692332).

Almost surely, 2^257868685 is an apocalyptic number.

It is an amenable number.

257868685 is a deficient number, since it is larger than the sum of its proper divisors (51669971).

257868685 is a wasteful number, since it uses less digits than its factorization.

257868685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16043.

The product of its digits is 6451200, while the sum is 55.

The square root of 257868685 is about 16058.2902265465. The cubic root of 257868685 is about 636.5016520283.

The spelling of 257868685 in words is "two hundred fifty-seven million, eight hundred sixty-eight thousand, six hundred eighty-five".