285307686 has 108 divisors (see below), whose sum is σ = 690230268. Its totient is φ = 85141584.

The previous prime is 285307679. The next prime is 285307691. The reversal of 285307686 is 686703582.

285307686 is a `hidden beast` number, since 285 + 307 + 68 + 6 = 666.

285307686 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 3437401 + ... + 3437483.

It is an arithmetic number, because the mean of its divisors is an integer number (6391021).

Almost surely, 2^285307686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285307686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345115134).

285307686 is an abundant number, since it is smaller than the sum of its proper divisors (404922582).

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

285307686 is a wasteful number, since it uses less digits than its factorization.

285307686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 285307686 is about 16891.0534307366. The cubic root of 285307686 is about 658.3211740032.

The spelling of 285307686 in words is "two hundred eighty-five million, three hundred seven thousand, six hundred eighty-six".