860066820 has 72 divisors (see below), whose sum is σ = 2627987544. Its totient is φ = 227670528.

The previous prime is 860066819. The next prime is 860066861. The reversal of 860066820 is 28660068.

It can be written as a sum of positive squares in 4 ways, for example, as 204604416 + 655462404 = 14304^2 + 25602^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7222 + ... + 42098.

It is an arithmetic number, because the mean of its divisors is an integer number (36499827).

Almost surely, 2^860066820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 860066820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1313993772).

860066820 is an abundant number, since it is smaller than the sum of its proper divisors (1767920724).

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

860066820 is a wasteful number, since it uses less digits than its factorization.

860066820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35029 (or 35024 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 860066820 is about 29326.8958466456. The cubic root of 860066820 is about 950.9931700160.

The spelling of 860066820 in words is "eight hundred sixty million, sixty-six thousand, eight hundred twenty".