257680005 has 16 divisors (see below), whose sum is σ = 449769024. Its totient is φ = 124935680.

The previous prime is 257679943. The next prime is 257680021. The reversal of 257680005 is 500086752.

It is a happy number.

It is not a de Polignac number, because 257680005 - 2⁹ = 257679493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780684 + ... + 781013.

It is an arithmetic number, because the mean of its divisors is an integer number (28110564).

Almost surely, 2^257680005 is an apocalyptic number.

It is an amenable number.

257680005 is a deficient number, since it is larger than the sum of its proper divisors (192089019).

257680005 is a wasteful number, since it uses less digits than its factorization.

257680005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561716.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 257680005 is about 16052.4143043967. The cubic root of 257680005 is about 636.3463734680.

The spelling of 257680005 in words is "two hundred fifty-seven million, six hundred eighty thousand, five".