257676887 has 4 divisors (see below), whose sum is σ = 277498200. Its totient is φ = 237855576.

The previous prime is 257676863. The next prime is 257676893. The reversal of 257676887 is 788676752.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 257676887 - 2¹⁰ = 257675863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257679887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9910637 + ... + 9910662.

It is an arithmetic number, because the mean of its divisors is an integer number (69374550).

Almost surely, 2^257676887 is an apocalyptic number.

257676887 is a deficient number, since it is larger than the sum of its proper divisors (19821313).

257676887 is a wasteful number, since it uses less digits than its factorization.

257676887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19821312.

The product of its digits is 7902720, while the sum is 56.

The square root of 257676887 is about 16052.3171847556. The cubic root of 257676887 is about 636.3438068014.

The spelling of 257676887 in words is "two hundred fifty-seven million, six hundred seventy-six thousand, eight hundred eighty-seven".