866064820 has 12 divisors (see below), whose sum is σ = 1818736164. Its totient is φ = 346425920.

The previous prime is 866064757. The next prime is 866064827. The reversal of 866064820 is 28460668.

It can be written as a sum of positive squares in 2 ways, for example, as 198979236 + 667085584 = 14106^2 + 25828^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866064827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21651601 + ... + 21651640.

It is an arithmetic number, because the mean of its divisors is an integer number (151561347).

Almost surely, 2^866064820 is an apocalyptic number.

It is an amenable number.

866064820 is an abundant number, since it is smaller than the sum of its proper divisors (952671344).

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

866064820 is a wasteful number, since it uses less digits than its factorization.

866064820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43303250 (or 43303248 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 866064820 is about 29428.9792551492. The cubic root of 866064820 is about 953.1987538305.

It can be divided in two parts, 8660648 and 20, that added together give a palindrome (8660668).

The spelling of 866064820 in words is "eight hundred sixty-six million, sixty-four thousand, eight hundred twenty".