285138056 has 48 divisors (see below), whose sum is σ = 623387340. Its totient is φ = 121914240.

The previous prime is 285138047. The next prime is 285138079. The reversal of 285138056 is 650831582.

It can be written as a sum of positive squares in 2 ways, for example, as 273373156 + 11764900 = 16534^2 + 3430^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302546 + ... + 303486.

Almost surely, 2^285138056 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 285138056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311693670).

285138056 is an abundant number, since it is smaller than the sum of its proper divisors (338249284).

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

285138056 is a wasteful number, since it uses less digits than its factorization.

285138056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 1723 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 285138056 is about 16886.0313869186. The cubic root of 285138056 is about 658.1906796107.

The spelling of 285138056 in words is "two hundred eighty-five million, one hundred thirty-eight thousand, fifty-six".