285664938 has 96 divisors (see below), whose sum is σ = 659288448. Its totient is φ = 81959040.

The previous prime is 285664937. The next prime is 285664963. The reversal of 285664938 is 839466582.

It is not an unprimeable number, because it can be changed into a prime (285664937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2773395 + ... + 2773497.

It is an arithmetic number, because the mean of its divisors is an integer number (6867588).

Almost surely, 2^285664938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285664938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329644224).

285664938 is an abundant number, since it is smaller than the sum of its proper divisors (373623510).

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

285664938 is a wasteful number, since it uses less digits than its factorization.

285664938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 189 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The square root of 285664938 is about 16901.6253064609. The cubic root of 285664938 is about 658.5958347429.

The spelling of 285664938 in words is "two hundred eighty-five million, six hundred sixty-four thousand, nine hundred thirty-eight".