257856797 has 4 divisors (see below), whose sum is σ = 281298336. Its totient is φ = 234415260.

The previous prime is 257856793. The next prime is 257856817. The reversal of 257856797 is 797658752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257856797 - 2² = 257856793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257856793) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11720753 + ... + 11720774.

It is an arithmetic number, because the mean of its divisors is an integer number (70324584).

Almost surely, 2^257856797 is an apocalyptic number.

It is an amenable number.

257856797 is a deficient number, since it is larger than the sum of its proper divisors (23441539).

257856797 is a wasteful number, since it uses less digits than its factorization.

257856797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23441538.

The product of its digits is 7408800, while the sum is 56.

The square root of 257856797 is about 16057.9200707937. The cubic root of 257856797 is about 636.4918707606.

The spelling of 257856797 in words is "two hundred fifty-seven million, eight hundred fifty-six thousand, seven hundred ninety-seven".