257157278 has 16 divisors (see below), whose sum is σ = 441176064. Its totient is φ = 110126520.

The previous prime is 257157259. The next prime is 257157293. The reversal of 257157278 is 872751752.

It is a super-2 number, since 2×257157278² = 132259731256738568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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, 14351 + ... + 26837.

It is an arithmetic number, because the mean of its divisors is an integer number (27573504).

Almost surely, 2^257157278 is an apocalyptic number.

257157278 is a deficient number, since it is larger than the sum of its proper divisors (184018786).

257157278 is a wasteful number, since it uses less digits than its factorization.

257157278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13967.

The product of its digits is 274400, while the sum is 44.

The square root of 257157278 is about 16036.1241576635. The cubic root of 257157278 is about 635.9157869459.

The spelling of 257157278 in words is "two hundred fifty-seven million, one hundred fifty-seven thousand, two hundred seventy-eight".