866800820 has 24 divisors (see below), whose sum is σ = 1824232704. Its totient is φ = 345967776.

The previous prime is 866800819. The next prime is 866800829. The reversal of 866800820 is 28008668.

866800820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866800829) 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, 37544 + ... + 56063.

It is an arithmetic number, because the mean of its divisors is an integer number (76009696).

Almost surely, 2^866800820 is an apocalyptic number.

It is an amenable number.

866800820 is an abundant number, since it is smaller than the sum of its proper divisors (957431884).

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

866800820 is a wasteful number, since it uses less digits than its factorization.

866800820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94079 (or 94077 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 866800820 is about 29441.4812806693. The cubic root of 866800820 is about 953.4686934580.

The spelling of 866800820 in words is "eight hundred sixty-six million, eight hundred thousand, eight hundred twenty".