286868820 has 48 divisors (see below), whose sum is σ = 917981568. Its totient is φ = 65569920.

The previous prime is 286868779. The next prime is 286868851. The reversal of 286868820 is 28868682.

It is a self number, because there is not a number n which added to its sum of digits gives 286868820.

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 15 ways as a sum of consecutive naturals, for example, 341091 + ... + 341930.

It is an arithmetic number, because the mean of its divisors is an integer number (19124616).

Almost surely, 2^286868820 is an apocalyptic number.

286868820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

286868820 is an abundant number, since it is smaller than the sum of its proper divisors (631112748).

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

286868820 is a wasteful number, since it uses less digits than its factorization.

286868820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683040 (or 683038 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The square root of 286868820 is about 16937.2022483054. The cubic root of 286868820 is about 659.5197148582.

The spelling of 286868820 in words is "two hundred eighty-six million, eight hundred sixty-eight thousand, eight hundred twenty".