257947730 has 8 divisors (see below), whose sum is σ = 464305932. Its totient is φ = 103179088.

The previous prime is 257947673. The next prime is 257947733. The reversal of 257947730 is 37749752.

It can be written as a sum of positive squares in 2 ways, for example, as 253541929 + 4405801 = 15923^2 + 2099^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257947733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12897377 + ... + 12897396.

Almost surely, 2^257947730 is an apocalyptic number.

257947730 is a deficient number, since it is larger than the sum of its proper divisors (206358202).

257947730 is a wasteful number, since it uses less digits than its factorization.

257947730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25794780.

The product of its (nonzero) digits is 370440, while the sum is 44.

The square root of 257947730 is about 16060.7512277602. The cubic root of 257947730 is about 636.5666814226.

The spelling of 257947730 in words is "two hundred fifty-seven million, nine hundred forty-seven thousand, seven hundred thirty".