257478 has 16 divisors (see below), whose sum is σ = 554736. Its totient is φ = 79200.

The previous prime is 257473. The next prime is 257489. The reversal of 257478 is 874752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257473) by changing a digit.

257478 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 in 7 ways as a sum of consecutive naturals, for example, 1573 + ... + 1728.

It is an arithmetic number, because the mean of its divisors is an integer number (34671).

2²⁵⁷⁴⁷⁸ is an apocalyptic number.

257478 is an abundant number, since it is smaller than the sum of its proper divisors (297258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257478 is a wasteful number, since it uses less digits than its factorization.

257478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319.

The product of its digits is 15680, while the sum is 33.

The square root of 257478 is about 507.4229005475. The cubic root of 257478 is about 63.6180044751.

It can be divided in two parts, 25 and 7478, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 257478 in words is "two hundred fifty-seven thousand, four hundred seventy-eight".