2891667728 has 20 divisors (see below), whose sum is σ = 5612682060. Its totient is φ = 1443233664.

The previous prime is 2891667719. The next prime is 2891667733. The reversal of 2891667728 is 8277661982.

It can be written as a sum of positive squares in 2 ways, for example, as 910349584 + 1981318144 = 30172^2 + 44512^2 .

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, 153323 + ... + 171146.

It is an arithmetic number, because the mean of its divisors is an integer number (280634103).

Almost surely, 2^2891667728 is an apocalyptic number.

It is an amenable number.

2891667728 is a deficient number, since it is larger than the sum of its proper divisors (2721014332).

2891667728 is a wasteful number, since it uses less digits than its factorization.

2891667728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325034 (or 325028 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 56.

The square root of 2891667728 is about 53774.2292180929. The cubic root of 2891667728 is about 1424.6760692650.

The spelling of 2891667728 in words is "two billion, eight hundred ninety-one million, six hundred sixty-seven thousand, seven hundred twenty-eight".