866210220 has 48 divisors (see below), whose sum is σ = 2694877920. Its totient is φ = 230989248.

The previous prime is 866210207. The next prime is 866210221. The reversal of 866210220 is 22012668.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (866210221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801507 + ... + 802586.

It is an arithmetic number, because the mean of its divisors is an integer number (56143290).

Almost surely, 2^866210220 is an apocalyptic number.

It is an amenable number.

866210220 is an abundant number, since it is smaller than the sum of its proper divisors (1828667700).

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

866210220 is a wasteful number, since it uses less digits than its factorization.

866210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604111 (or 1604103 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 866210220 is about 29431.4495055884. The cubic root of 866210220 is about 953.2520936961.

Adding to 866210220 its reverse (22012668), we get a palindrome (888222888).

The spelling of 866210220 in words is "eight hundred sixty-six million, two hundred ten thousand, two hundred twenty".