255478 has 4 divisors (see below), whose sum is σ = 383220. Its totient is φ = 127738.

The previous prime is 255473. The next prime is 255487. The reversal of 255478 is 874552.

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

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 an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255473) by changing a digit.

255478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63868 + ... + 63871.

It is an arithmetic number, because the mean of its divisors is an integer number (95805).

2²⁵⁵⁴⁷⁸ is an apocalyptic number.

255478 is a deficient number, since it is larger than the sum of its proper divisors (127742).

255478 is a wasteful number, since it uses less digits than its factorization.

255478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127741.

The product of its digits is 11200, while the sum is 31.

The square root of 255478 is about 505.4483158544. The cubic root of 255478 is about 63.4528552458.

The spelling of 255478 in words is "two hundred fifty-five thousand, four hundred seventy-eight".