257385478 has 8 divisors (see below), whose sum is σ = 441232272. Its totient is φ = 110308056.

The previous prime is 257385461. The next prime is 257385497. The reversal of 257385478 is 874583752.

257385478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9192325 + ... + 9192352.

It is an arithmetic number, because the mean of its divisors is an integer number (55154034).

Almost surely, 2^257385478 is an apocalyptic number.

257385478 is a deficient number, since it is larger than the sum of its proper divisors (183846794).

257385478 is a wasteful number, since it uses less digits than its factorization.

257385478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18384686.

The product of its digits is 1881600, while the sum is 49.

The square root of 257385478 is about 16043.2377654886. The cubic root of 257385478 is about 636.1038340946.

The spelling of 257385478 in words is "two hundred fifty-seven million, three hundred eighty-five thousand, four hundred seventy-eight".