257078 has 8 divisors (see below), whose sum is σ = 388368. Its totient is φ = 127624.

The previous prime is 257077. The next prime is 257093. The reversal of 257078 is 870752.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 257078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (48546).

2²⁵⁷⁰⁷⁸ is an apocalyptic number.

257078 is a deficient number, since it is larger than the sum of its proper divisors (131290).

257078 is a wasteful number, since it uses less digits than its factorization.

257078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 257078 is about 507.0285987989. The cubic root of 257078 is about 63.5850432242.

Subtracting from 257078 its sum of digits (29), we obtain a square (257049 = 507²).

The spelling of 257078 in words is "two hundred fifty-seven thousand, seventy-eight".