866811812 has 24 divisors (see below), whose sum is σ = 1525305600. Its totient is φ = 431018336.

The previous prime is 866811761. The next prime is 866811817. The reversal of 866811812 is 218118668.

It is a self number, because there is not a number n which added to its sum of digits gives 866811812.

It is not an unprimeable number, because it can be changed into a prime (866811817) 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, 744743 + ... + 745905.

It is an arithmetic number, because the mean of its divisors is an integer number (63554400).

Almost surely, 2^866811812 is an apocalyptic number.

It is an amenable number.

866811812 is a deficient number, since it is larger than the sum of its proper divisors (658493788).

866811812 is a wasteful number, since it uses less digits than its factorization.

866811812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035 (or 2033 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 866811812 is about 29441.6679554675. The cubic root of 866811812 is about 953.4727237893.

The spelling of 866811812 in words is "eight hundred sixty-six million, eight hundred eleven thousand, eight hundred twelve".