257897995 has 8 divisors (see below), whose sum is σ = 317026080. Its totient is φ = 201286080.

The previous prime is 257897993. The next prime is 257897999. The reversal of 257897995 is 599798752.

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

It is not a de Polignac number, because 257897995 - 2¹ = 257897993 is a prime.

It is a super-2 number, since 2×257897995² = 133022751650040050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257897993) 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 7 ways as a sum of consecutive naturals, for example, 628815 + ... + 629224.

It is an arithmetic number, because the mean of its divisors is an integer number (39628260).

Almost surely, 2^257897995 is an apocalyptic number.

257897995 is a deficient number, since it is larger than the sum of its proper divisors (59128085).

257897995 is a wasteful number, since it uses less digits than its factorization.

257897995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258085.

The product of its digits is 14288400, while the sum is 61.

The square root of 257897995 is about 16059.2028133404. The cubic root of 257897995 is about 636.5257665715.

The spelling of 257897995 in words is "two hundred fifty-seven million, eight hundred ninety-seven thousand, nine hundred ninety-five".