257738071 has 4 divisors (see below), whose sum is σ = 272899152. Its totient is φ = 242576992.

The previous prime is 257738017. The next prime is 257738077. The reversal of 257738071 is 170837752.

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 257738071 - 2²⁷ = 123520343 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 (257738077) 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 3 ways as a sum of consecutive naturals, for example, 7580515 + ... + 7580548.

It is an arithmetic number, because the mean of its divisors is an integer number (68224788).

Almost surely, 2^257738071 is an apocalyptic number.

257738071 is a deficient number, since it is larger than the sum of its proper divisors (15161081).

257738071 is a wasteful number, since it uses less digits than its factorization.

257738071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15161080.

The product of its (nonzero) digits is 82320, while the sum is 40.

The square root of 257738071 is about 16054.2228401128. Note that the first 3 decimals coincide. The cubic root of 257738071 is about 636.3941682945.

The spelling of 257738071 in words is "two hundred fifty-seven million, seven hundred thirty-eight thousand, seventy-one".