2668661728 has 24 divisors (see below), whose sum is σ = 5255114760. Its totient is φ = 1334029440.

The previous prime is 2668661719. The next prime is 2668661747. The reversal of 2668661728 is 8271668662.

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, 221623 + ... + 233353.

It is an arithmetic number, because the mean of its divisors is an integer number (218963115).

Almost surely, 2^2668661728 is an apocalyptic number.

It is an amenable number.

2668661728 is a deficient number, since it is larger than the sum of its proper divisors (2586453032).

2668661728 is a wasteful number, since it uses less digits than its factorization.

2668661728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18850 (or 18842 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 2668661728 is about 51659.0914360677. The cubic root of 2668661728 is about 1387.0682870616.

The spelling of 2668661728 in words is "two billion, six hundred sixty-eight million, six hundred sixty-one thousand, seven hundred twenty-eight".