285655 has 4 divisors (see below), whose sum is σ = 342792. Its totient is φ = 228520.

The previous prime is 285643. The next prime is 285661. The reversal of 285655 is 556582.

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

It is not a de Polignac number, because 285655 - 2¹¹ = 283607 is a prime.

It is a Duffinian number.

285655 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28561 + ... + 28570.

It is an arithmetic number, because the mean of its divisors is an integer number (85698).

2²⁸⁵⁶⁵⁵ is an apocalyptic number.

285655 is a deficient number, since it is larger than the sum of its proper divisors (57137).

285655 is an equidigital number, since it uses as much as digits as its factorization.

285655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57136.

The product of its digits is 12000, while the sum is 31.

The square root of 285655 is about 534.4670242400. The cubic root of 285655 is about 65.8588197356.

It can be divided in two parts, 2856 and 55, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 285655 in words is "two hundred eighty-five thousand, six hundred fifty-five".