285903728 has 20 divisors (see below), whose sum is σ = 604296888. Its totient is φ = 129956160.

The previous prime is 285903727. The next prime is 285903743. The reversal of 285903728 is 827309582.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285903727) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 812051 + ... + 812402.

Almost surely, 2^285903728 is an apocalyptic number.

It is an amenable number.

285903728 is an abundant number, since it is smaller than the sum of its proper divisors (318393160).

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

285903728 is a wasteful number, since it uses less digits than its factorization.

285903728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624472 (or 1624466 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 285903728 is about 16908.6879443675. The cubic root of 285903728 is about 658.7792924454.

The spelling of 285903728 in words is "two hundred eighty-five million, nine hundred three thousand, seven hundred twenty-eight".