257948779 has 4 divisors (see below), whose sum is σ = 281398680. Its totient is φ = 234498880.

The previous prime is 257948741. The next prime is 257948813. The reversal of 257948779 is 977849752.

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

It is not a de Polignac number, because 257948779 - 2²⁷ = 123731051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257948729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11724934 + ... + 11724955.

It is an arithmetic number, because the mean of its divisors is an integer number (70349670).

Almost surely, 2^257948779 is an apocalyptic number.

257948779 is a deficient number, since it is larger than the sum of its proper divisors (23449901).

257948779 is a wasteful number, since it uses less digits than its factorization.

257948779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23449900.

The product of its digits is 8890560, while the sum is 58.

The square root of 257948779 is about 16060.7838849790. The cubic root of 257948779 is about 636.5675443332.

The spelling of 257948779 in words is "two hundred fifty-seven million, nine hundred forty-eight thousand, seven hundred seventy-nine".