257680567 has 4 divisors (see below), whose sum is σ = 259961040. Its totient is φ = 255400096.

The previous prime is 257680561. The next prime is 257680589. The reversal of 257680567 is 765086752.

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 257680567 - 2⁷ = 257680439 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 (257680561) 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, 1140067 + ... + 1140292.

It is an arithmetic number, because the mean of its divisors is an integer number (64990260).

Almost surely, 2^257680567 is an apocalyptic number.

257680567 is a deficient number, since it is larger than the sum of its proper divisors (2280473).

257680567 is a wasteful number, since it uses less digits than its factorization.

257680567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280472.

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 257680567 is about 16052.4318095421. The cubic root of 257680567 is about 636.3468360914.

The spelling of 257680567 in words is "two hundred fifty-seven million, six hundred eighty thousand, five hundred sixty-seven".