285278 has 24 divisors (see below), whose sum is σ = 517104. Its totient is φ = 117600.

The previous prime is 285251. The next prime is 285281. The reversal of 285278 is 872582.

It is a d-powerful number, because it can be written as 2⁷ + 8⁴ + 2¹⁴ + 5³ + 7⁴ + 8⁶ .

Its product of digits (8960) is a multiple of the sum of its prime factors (128).

It is a congruent number.

It is an unprimeable number.

285278 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 11 ways as a sum of consecutive naturals, for example, 3983 + ... + 4053.

It is an arithmetic number, because the mean of its divisors is an integer number (21546).

2²⁸⁵²⁷⁸ is an apocalyptic number.

285278 is a deficient number, since it is larger than the sum of its proper divisors (231826).

285278 is a wasteful number, since it uses less digits than its factorization.

285278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 121 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 285278 is about 534.1142199942. The cubic root of 285278 is about 65.8298340642.

The spelling of 285278 in words is "two hundred eighty-five thousand, two hundred seventy-eight".