2685643884 has 384 divisors, whose sum is σ = 9326499840. Its totient is φ = 652354560.

The previous prime is 2685643859. The next prime is 2685643897. The reversal of 2685643884 is 4883465862.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 2685643884.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 17105934 + ... + 17106090.

It is an arithmetic number, because the mean of its divisors is an integer number (24287760).

Almost surely, 2^2685643884 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 2685643884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4663249920).

2685643884 is an abundant number, since it is smaller than the sum of its proper divisors (6640855956).

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

2685643884 is a wasteful number, since it uses less digits than its factorization.

2685643884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 197 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 54.

The square root of 2685643884 is about 51823.1983188996. The cubic root of 2685643884 is about 1390.0042930703.

The spelling of 2685643884 in words is "two billion, six hundred eighty-five million, six hundred forty-three thousand, eight hundred eighty-four".