257098 has 4 divisors (see below), whose sum is σ = 385650. Its totient is φ = 128548.

The previous prime is 257093. The next prime is 257099. The reversal of 257098 is 890752.

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

It can be written as a sum of positive squares in only one way, i.e., 257049 + 49 = 507^2 + 7^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (257093) by changing a digit.

257098 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64273 + ... + 64276.

2²⁵⁷⁰⁹⁸ is an apocalyptic number.

257098 is a deficient number, since it is larger than the sum of its proper divisors (128552).

257098 is a wasteful number, since it uses less digits than its factorization.

257098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128551.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 257098 is about 507.0483211687. The cubic root of 257098 is about 63.5866920984.

The spelling of 257098 in words is "two hundred fifty-seven thousand, ninety-eight".