868690820 has 24 divisors (see below), whose sum is σ = 1931560344. Its totient is φ = 327036416.

The previous prime is 868690789. The next prime is 868690831. The reversal of 868690820 is 28096868.

868690820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 480837184 + 387853636 = 21928^2 + 19694^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1277147 + ... + 1277826.

It is an arithmetic number, because the mean of its divisors is an integer number (80481681).

Almost surely, 2^868690820 is an apocalyptic number.

It is an amenable number.

868690820 is an abundant number, since it is smaller than the sum of its proper divisors (1062869524).

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

868690820 is a wasteful number, since it uses less digits than its factorization.

868690820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554999 (or 2554997 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 868690820 is about 29473.5613728643. The cubic root of 868690820 is about 954.1611815206.

The spelling of 868690820 in words is "eight hundred sixty-eight million, six hundred ninety thousand, eight hundred twenty".