257711478 has 16 divisors (see below), whose sum is σ = 542550720. Its totient is φ = 81382536.

The previous prime is 257711477. The next prime is 257711479. The reversal of 257711478 is 874117752.

It is an interprime number because it is at equal distance from previous prime (257711477) and next prime (257711479).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257711473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130200 + ... + 1130427.

It is an arithmetic number, because the mean of its divisors is an integer number (33909420).

Almost surely, 2^257711478 is an apocalyptic number.

257711478 is an abundant number, since it is smaller than the sum of its proper divisors (284839242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257711478 is a wasteful number, since it uses less digits than its factorization.

257711478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260651.

The product of its digits is 109760, while the sum is 42.

The square root of 257711478 is about 16053.3945942906. The cubic root of 257711478 is about 636.3722801658.

The spelling of 257711478 in words is "two hundred fifty-seven million, seven hundred eleven thousand, four hundred seventy-eight".