285821982 has 24 divisors (see below), whose sum is σ = 621049104. Its totient is φ = 95001984.

The previous prime is 285821917. The next prime is 285822007. The reversal of 285821982 is 289128582.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16138 + ... + 28845.

It is an arithmetic number, because the mean of its divisors is an integer number (25877046).

Almost surely, 2^285821982 is an apocalyptic number.

285821982 is an abundant number, since it is smaller than the sum of its proper divisors (335227122).

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

285821982 is a wasteful number, since it uses less digits than its factorization.

285821982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45344 (or 45341 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 285821982 is about 16906.2704935181. The cubic root of 285821982 is about 658.7165000901.

The spelling of 285821982 in words is "two hundred eighty-five million, eight hundred twenty-one thousand, nine hundred eighty-two".