257840087 has 8 divisors (see below), whose sum is σ = 266188176. Its totient is φ = 249564672.

The previous prime is 257840069. The next prime is 257840119. The reversal of 257840087 is 780048752.

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

It is a cyclic number.

It is not a de Polignac number, because 257840087 - 2⁸ = 257839831 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 (257840047) 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 7 ways as a sum of consecutive naturals, for example, 10913 + ... + 25194.

It is an arithmetic number, because the mean of its divisors is an integer number (33273522).

Almost surely, 2^257840087 is an apocalyptic number.

257840087 is a deficient number, since it is larger than the sum of its proper divisors (8348089).

257840087 is a wasteful number, since it uses less digits than its factorization.

257840087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36337.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 257840087 is about 16057.3997583669. The cubic root of 257840087 is about 636.4781215155.

The spelling of 257840087 in words is "two hundred fifty-seven million, eight hundred forty thousand, eighty-seven".