257342885 has 16 divisors (see below), whose sum is σ = 314325360. Its totient is φ = 202222080.

The previous prime is 257342879. The next prime is 257342893. The reversal of 257342885 is 588243752.

It can be written as a sum of positive squares in 8 ways, for example, as 3928324 + 253414561 = 1982^2 + 15919^2 .

It is not a de Polignac number, because 257342885 - 2⁸ = 257342629 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96875 + ... + 99495.

It is an arithmetic number, because the mean of its divisors is an integer number (19645335).

Almost surely, 2^257342885 is an apocalyptic number.

It is an amenable number.

257342885 is a deficient number, since it is larger than the sum of its proper divisors (56982475).

257342885 is a wasteful number, since it uses less digits than its factorization.

257342885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968.

The product of its digits is 537600, while the sum is 44.

The square root of 257342885 is about 16041.9102665487. The cubic root of 257342885 is about 636.0687439703.

The spelling of 257342885 in words is "two hundred fifty-seven million, three hundred forty-two thousand, eight hundred eighty-five".