257138270 has 16 divisors (see below), whose sum is σ = 467622288. Its totient is φ = 101794560.

The previous prime is 257138263. The next prime is 257138281. The reversal of 257138270 is 72831752.

It is a super-2 number, since 2×257138270² = 132240179797185800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257138270.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131576 + ... + 133515.

It is an arithmetic number, because the mean of its divisors is an integer number (29226393).

Almost surely, 2^257138270 is an apocalyptic number.

257138270 is a deficient number, since it is larger than the sum of its proper divisors (210484018).

257138270 is a wasteful number, since it uses less digits than its factorization.

257138270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265195.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 257138270 is about 16035.5314847996. The cubic root of 257138270 is about 635.9001184735.

The spelling of 257138270 in words is "two hundred fifty-seven million, one hundred thirty-eight thousand, two hundred seventy".