257255538 has 16 divisors (see below), whose sum is σ = 514687296. Its totient is φ = 85722480.

The previous prime is 257255519. The next prime is 257255563. The reversal of 257255538 is 835552752.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 257255538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18795 + ... + 29457.

It is an arithmetic number, because the mean of its divisors is an integer number (32167956).

Almost surely, 2^257255538 is an apocalyptic number.

257255538 is an abundant number, since it is smaller than the sum of its proper divisors (257431758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257255538 is a wasteful number, since it uses less digits than its factorization.

257255538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14689.

The product of its digits is 420000, while the sum is 42.

The square root of 257255538 is about 16039.1875729415. The cubic root of 257255538 is about 635.9967712743.

The spelling of 257255538 in words is "two hundred fifty-seven million, two hundred fifty-five thousand, five hundred thirty-eight".