257492705 has 16 divisors (see below), whose sum is σ = 323357184. Its totient is φ = 196468800.

The previous prime is 257492701. The next prime is 257492749. The reversal of 257492705 is 507294752.

257492705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 257492705 - 2² = 257492701 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257492701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39155 + ... + 45255.

It is an arithmetic number, because the mean of its divisors is an integer number (20209824).

Almost surely, 2^257492705 is an apocalyptic number.

It is an amenable number.

257492705 is a deficient number, since it is larger than the sum of its proper divisors (65864479).

257492705 is a wasteful number, since it uses less digits than its factorization.

257492705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 257492705 is about 16046.5792304778. The cubic root of 257492705 is about 636.1921556227.

The spelling of 257492705 in words is "two hundred fifty-seven million, four hundred ninety-two thousand, seven hundred five".