257925707 has 8 divisors (see below), whose sum is σ = 283676736. Its totient is φ = 233019072.

The previous prime is 257925643. The next prime is 257925713. The reversal of 257925707 is 707529752.

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

It is not a de Polignac number, because 257925707 - 2⁶ = 257925643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257925607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210458 + ... + 211679.

It is an arithmetic number, because the mean of its divisors is an integer number (35459592).

Almost surely, 2^257925707 is an apocalyptic number.

257925707 is a deficient number, since it is larger than the sum of its proper divisors (25751029).

257925707 is a wasteful number, since it uses less digits than its factorization.

257925707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422197.

The product of its (nonzero) digits is 308700, while the sum is 44.

The square root of 257925707 is about 16060.0655976244. The cubic root of 257925707 is about 636.5485646940.

The spelling of 257925707 in words is "two hundred fifty-seven million, nine hundred twenty-five thousand, seven hundred seven".