285904990 has 32 divisors (see below), whose sum is σ = 591572160. Its totient is φ = 97453824.

The previous prime is 285904967. The next prime is 285904999. The reversal of 285904990 is 99409582.

It is a self number, because there is not a number n which added to its sum of digits gives 285904990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285904999) 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 15 ways as a sum of consecutive naturals, for example, 306 + ... + 23914.

It is an arithmetic number, because the mean of its divisors is an integer number (18486630).

Almost surely, 2^285904990 is an apocalyptic number.

285904990 is an abundant number, since it is smaller than the sum of its proper divisors (305667170).

285904990 is a wasteful number, since it uses less digits than its factorization.

285904990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23796.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 285904990 is about 16908.7252624200. The cubic root of 285904990 is about 658.7802617440.

The spelling of 285904990 in words is "two hundred eighty-five million, nine hundred four thousand, nine hundred ninety".