285112840 has 32 divisors (see below), whose sum is σ = 642919680. Its totient is φ = 113793472.

The previous prime is 285112837. The next prime is 285112847. The reversal of 285112840 is 48211582.

It is not an unprimeable number, because it can be changed into a prime (285112847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11049 + ... + 26311.

It is an arithmetic number, because the mean of its divisors is an integer number (20091240).

Almost surely, 2^285112840 is an apocalyptic number.

285112840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285112840 is an abundant number, since it is smaller than the sum of its proper divisors (357806840).

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

285112840 is a wasteful number, since it uses less digits than its factorization.

285112840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15741 (or 15737 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 285112840 is about 16885.2847177653. The cubic root of 285112840 is about 658.1712768161.

The spelling of 285112840 in words is "two hundred eighty-five million, one hundred twelve thousand, eight hundred forty".