285239808 has 240 divisors, whose sum is σ = 970295040. Its totient is φ = 78962688.

The previous prime is 285239803. The next prime is 285239809. The reversal of 285239808 is 808932582.

It is not an unprimeable number, because it can be changed into a prime (285239803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1193353 + ... + 1193591.

It is an arithmetic number, because the mean of its divisors is an integer number (4042896).

Almost surely, 2^285239808 is an apocalyptic number.

285239808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285239808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485147520).

285239808 is an abundant number, since it is smaller than the sum of its proper divisors (685055232).

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

285239808 is a wasteful number, since it uses less digits than its factorization.

285239808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 285239808 is about 16889.0440226793. The cubic root of 285239808 is about 658.2689624540.

The spelling of 285239808 in words is "two hundred eighty-five million, two hundred thirty-nine thousand, eight hundred eight".