868820 has 12 divisors (see below), whose sum is σ = 1824564. Its totient is φ = 347520.

The previous prime is 868817. The next prime is 868841. The reversal of 868820 is 28868.

It can be written as a sum of positive squares in 2 ways, for example, as 300304 + 568516 = 548^2 + 754^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21701 + ... + 21740.

It is an arithmetic number, because the mean of its divisors is an integer number (152047).

2⁸⁶⁸⁸²⁰ is an apocalyptic number.

It is an amenable number.

868820 is an abundant number, since it is smaller than the sum of its proper divisors (955744).

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

868820 is a wasteful number, since it uses less digits than its factorization.

868820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43450 (or 43448 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 868820 is about 932.1051442836. The cubic root of 868820 is about 95.4208475843.

The spelling of 868820 in words is "eight hundred sixty-eight thousand, eight hundred twenty".