2866864 has 80 divisors (see below), whose sum is σ = 7499520. Its totient is φ = 1025280.

The previous prime is 2866847. The next prime is 2866867. The reversal of 2866864 is 4686682.

It is not an unprimeable number, because it can be changed into a prime (2866867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15927 + ... + 16105.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2^2866864 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 2866864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3749760).

2866864 is an abundant number, since it is smaller than the sum of its proper divisors (4632656).

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

2866864 is a wasteful number, since it uses less digits than its factorization.

2866864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 212 counting only the distinct ones).

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

The square root of 2866864 is about 1693.1816205003. The cubic root of 2866864 is about 142.0590906620.

The spelling of 2866864 in words is "two million, eight hundred sixty-six thousand, eight hundred sixty-four".