2861864208 has 180 divisors, whose sum is σ = 9807698160. Its totient is φ = 774603648.

The previous prime is 2861864179. The next prime is 2861864221. The reversal of 2861864208 is 8024681682.

2861864208 is a `hidden beast` number, since 2 + 8 + 618 + 6 + 4 + 20 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 123391 + ... + 144737.

It is an arithmetic number, because the mean of its divisors is an integer number (54487212).

Almost surely, 2^2861864208 is an apocalyptic number.

2861864208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2861864208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4903849080).

2861864208 is an abundant number, since it is smaller than the sum of its proper divisors (6945833952).

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

2861864208 is a wasteful number, since it uses less digits than its factorization.

2861864208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21394 (or 21378 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 2861864208 is about 53496.3943457875. The cubic root of 2861864208 is about 1419.7645923325.

The spelling of 2861864208 in words is "two billion, eight hundred sixty-one million, eight hundred sixty-four thousand, two hundred eight".