285878 has 4 divisors (see below), whose sum is σ = 428820. Its totient is φ = 142938.

The previous prime is 285871. The next prime is 285937. The reversal of 285878 is 878582.

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

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 285878.

It is not an unprimeable number, because it can be changed into a prime (285871) by changing a digit.

285878 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, 71468 + ... + 71471.

It is an arithmetic number, because the mean of its divisors is an integer number (107205).

2²⁸⁵⁸⁷⁸ is an apocalyptic number.

285878 is a deficient number, since it is larger than the sum of its proper divisors (142942).

285878 is a wasteful number, since it uses less digits than its factorization.

285878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142941.

The product of its digits is 35840, while the sum is 38.

The square root of 285878 is about 534.6756025853. The cubic root of 285878 is about 65.8759531036.

Subtracting 285878 from its reverse (878582), we obtain a cube (592704 = 84³).

The spelling of 285878 in words is "two hundred eighty-five thousand, eight hundred seventy-eight".