285809685 has 32 divisors (see below), whose sum is σ = 550133760. Its totient is φ = 123778368.

The previous prime is 285809681. The next prime is 285809687. The reversal of 285809685 is 586908582.

It is not a de Polignac number, because 285809685 - 2² = 285809681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285809681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69637 + ... + 73626.

It is an arithmetic number, because the mean of its divisors is an integer number (17191680).

Almost surely, 2^285809685 is an apocalyptic number.

It is an amenable number.

285809685 is a deficient number, since it is larger than the sum of its proper divisors (264324075).

285809685 is a wasteful number, since it uses less digits than its factorization.

285809685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143297.

The product of its (nonzero) digits is 1382400, while the sum is 51.

The square root of 285809685 is about 16905.9068079769. The cubic root of 285809685 is about 658.7070532392.

The spelling of 285809685 in words is "two hundred eighty-five million, eight hundred nine thousand, six hundred eighty-five".