257500478 has 4 divisors (see below), whose sum is σ = 386250720. Its totient is φ = 128750238.

The previous prime is 257500471. The next prime is 257500487. The reversal of 257500478 is 874005752.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257500471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64375118 + ... + 64375121.

It is an arithmetic number, because the mean of its divisors is an integer number (96562680).

Almost surely, 2^257500478 is an apocalyptic number.

257500478 is a deficient number, since it is larger than the sum of its proper divisors (128750242).

257500478 is a wasteful number, since it uses less digits than its factorization.

257500478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128750241.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 257500478 is about 16046.8214298035. The cubic root of 257500478 is about 636.1985571916.

The spelling of 257500478 in words is "two hundred fifty-seven million, five hundred thousand, four hundred seventy-eight".