257713765 has 4 divisors (see below), whose sum is σ = 309256524. Its totient is φ = 206171008.

The previous prime is 257713751. The next prime is 257713783. The reversal of 257713765 is 567317752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 180660481 + 77053284 = 13441^2 + 8778^2 .

It is a cyclic number.

It is not a de Polignac number, because 257713765 - 2¹⁷ = 257582693 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 25771372 + ... + 25771381.

It is an arithmetic number, because the mean of its divisors is an integer number (77314131).

Almost surely, 2^257713765 is an apocalyptic number.

It is an amenable number.

257713765 is a deficient number, since it is larger than the sum of its proper divisors (51542759).

257713765 is an equidigital number, since it uses as much as digits as its factorization.

257713765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51542758.

The product of its digits is 308700, while the sum is 43.

The square root of 257713765 is about 16053.4658251731. The cubic root of 257713765 is about 636.3741626057.

The spelling of 257713765 in words is "two hundred fifty-seven million, seven hundred thirteen thousand, seven hundred sixty-five".