257497085 has 8 divisors (see below), whose sum is σ = 309243960. Its totient is φ = 205832704.

The previous prime is 257497081. The next prime is 257497091. The reversal of 257497085 is 580794752.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 86750596 + 170746489 = 9314^2 + 13067^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257497085 - 2² = 257497081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257497081) 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 7 ways as a sum of consecutive naturals, for example, 13532 + ... + 26421.

It is an arithmetic number, because the mean of its divisors is an integer number (38655495).

Almost surely, 2^257497085 is an apocalyptic number.

It is an amenable number.

257497085 is a deficient number, since it is larger than the sum of its proper divisors (51746875).

257497085 is a wasteful number, since it uses less digits than its factorization.

257497085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41247.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 257497085 is about 16046.7157075833. The cubic root of 257497085 is about 636.1957628522.

The spelling of 257497085 in words is "two hundred fifty-seven million, four hundred ninety-seven thousand, eighty-five".