257138258 has 8 divisors (see below), whose sum is σ = 415377228. Its totient is φ = 118679184.

The previous prime is 257138239. The next prime is 257138263. The reversal of 257138258 is 852831752.

It can be written as a sum of positive squares in 2 ways, for example, as 256864729 + 273529 = 16027^2 + 523^2 .

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

It is a super-2 number, since 2×257138258² = 132240167454549128, which contains 22 as substring.

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, 4944941 + ... + 4944992.

Almost surely, 2^257138258 is an apocalyptic number.

257138258 is a deficient number, since it is larger than the sum of its proper divisors (158238970).

257138258 is a wasteful number, since it uses less digits than its factorization.

257138258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9889948.

The product of its digits is 134400, while the sum is 41.

The square root of 257138258 is about 16035.5311106305. The cubic root of 257138258 is about 635.9001085816.

The spelling of 257138258 in words is "two hundred fifty-seven million, one hundred thirty-eight thousand, two hundred fifty-eight".