285708 has 24 divisors (see below), whose sum is σ = 690480. Its totient is φ = 91840.

The previous prime is 285707. The next prime is 285709. The reversal of 285708 is 807582.

It is an interprime number because it is at equal distance from previous prime (285707) and next prime (285709).

It is a super-2 number, since 2×285708² = 163258122528, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (285707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63 + ... + 758.

It is an arithmetic number, because the mean of its divisors is an integer number (28770).

2²⁸⁵⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345240).

285708 is an abundant number, since it is smaller than the sum of its proper divisors (404772).

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

285708 is a wasteful number, since it uses less digits than its factorization.

285708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 285708 is about 534.5166040452. The cubic root of 285708 is about 65.8628925992.

The spelling of 285708 in words is "two hundred eighty-five thousand, seven hundred eight".