2668781684 has 12 divisors (see below), whose sum is σ = 4682134884. Its totient is φ = 1331028864.

The previous prime is 2668781677. The next prime is 2668781693. The reversal of 2668781684 is 4861878662.

It can be written as a sum of positive squares in 2 ways, for example, as 1157904784 + 1510876900 = 34028^2 + 38870^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838709 + ... + 841884.

It is an arithmetic number, because the mean of its divisors is an integer number (390177907).

Almost surely, 2^2668781684 is an apocalyptic number.

It is an amenable number.

2668781684 is a deficient number, since it is larger than the sum of its proper divisors (2013353200).

2668781684 is a wasteful number, since it uses less digits than its factorization.

2668781684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680994 (or 1680992 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 56.

The square root of 2668781684 is about 51660.2524577649. The cubic root of 2668781684 is about 1387.0890695970.

The spelling of 2668781684 in words is "two billion, six hundred sixty-eight million, seven hundred eighty-one thousand, six hundred eighty-four".