257891079 has 8 divisors (see below), whose sum is σ = 347068800. Its totient is φ = 170320376.

The previous prime is 257891027. The next prime is 257891089. The reversal of 257891079 is 970198752.

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 257891079 - 2¹² = 257886983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257891089) 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, 401379 + ... + 402020.

It is an arithmetic number, because the mean of its divisors is an integer number (43383600).

Almost surely, 2^257891079 is an apocalyptic number.

257891079 is a deficient number, since it is larger than the sum of its proper divisors (89177721).

257891079 is a wasteful number, since it uses less digits than its factorization.

257891079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803509.

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 257891079 is about 16058.9874836491. The cubic root of 257891079 is about 636.5200766584.

The spelling of 257891079 in words is "two hundred fifty-seven million, eight hundred ninety-one thousand, seventy-nine".