205878 has 8 divisors (see below), whose sum is σ = 411768. Its totient is φ = 68624.

The previous prime is 205847. The next prime is 205879. The reversal of 205878 is 878502.

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

205878 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 205878.

It is not an unprimeable number, because it can be changed into a prime (205879) by changing a digit.

205878 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 3 ways as a sum of consecutive naturals, for example, 17151 + ... + 17162.

It is an arithmetic number, because the mean of its divisors is an integer number (51471).

2²⁰⁵⁸⁷⁸ is an apocalyptic number.

205878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

205878 is a wasteful number, since it uses less digits than its factorization.

205878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34318.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 205878 is about 453.7378097536. The cubic root of 205878 is about 59.0477445573.

The spelling of 205878 in words is "two hundred five thousand, eight hundred seventy-eight".