257228679 has 4 divisors (see below), whose sum is σ = 342971576. Its totient is φ = 171485784.

The previous prime is 257228639. The next prime is 257228687. The reversal of 257228679 is 976822752.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 257228679 - 2²⁰ = 256180103 is a prime.

It is a super-3 number, since 3×257228679³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257228639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42871444 + ... + 42871449.

It is an arithmetic number, because the mean of its divisors is an integer number (85742894).

Almost surely, 2^257228679 is an apocalyptic number.

257228679 is a deficient number, since it is larger than the sum of its proper divisors (85742897).

257228679 is an equidigital number, since it uses as much as digits as its factorization.

257228679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85742896.

The product of its digits is 846720, while the sum is 48.

The square root of 257228679 is about 16038.3502580534. The cubic root of 257228679 is about 635.9746365622.

The spelling of 257228679 in words is "two hundred fifty-seven million, two hundred twenty-eight thousand, six hundred seventy-nine".