285312990 has 32 divisors (see below), whose sum is σ = 689296896. Its totient is φ = 75578400.

The previous prime is 285312971. The next prime is 285313013. The reversal of 285312990 is 99213582.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26962 + ... + 36021.

It is an arithmetic number, because the mean of its divisors is an integer number (21540528).

Almost surely, 2^285312990 is an apocalyptic number.

285312990 is an abundant number, since it is smaller than the sum of its proper divisors (403983906).

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

285312990 is a wasteful number, since it uses less digits than its factorization.

285312990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63144.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 285312990 is about 16891.2104362002. The cubic root of 285312990 is about 658.3252534749.

The spelling of 285312990 in words is "two hundred eighty-five million, three hundred twelve thousand, nine hundred ninety".