257434287 has 32 divisors (see below), whose sum is σ = 400896000. Its totient is φ = 145283040.

The previous prime is 257434283. The next prime is 257434297. The reversal of 257434287 is 782434752.

It is a happy number.

It is not a de Polignac number, because 257434287 - 2² = 257434283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257434283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33514 + ... + 40472.

It is an arithmetic number, because the mean of its divisors is an integer number (12528000).

Almost surely, 2^257434287 is an apocalyptic number.

257434287 is a deficient number, since it is larger than the sum of its proper divisors (143461713).

257434287 is a wasteful number, since it uses less digits than its factorization.

257434287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7051.

The product of its digits is 376320, while the sum is 42.

The square root of 257434287 is about 16044.7588638783. The cubic root of 257434287 is about 636.1440404936.

The spelling of 257434287 in words is "two hundred fifty-seven million, four hundred thirty-four thousand, two hundred eighty-seven".