2128827991 has 8 divisors (see below), whose sum is σ = 2143088640. Its totient is φ = 2114585688.

The previous prime is 2128827977. The next prime is 2128828007. The reversal of 2128827991 is 1997288212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2128827991 - 2¹⁹ = 2128303703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128827391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290130 + ... + 297376.

It is an arithmetic number, because the mean of its divisors is an integer number (267886080).

Almost surely, 2^2128827991 is an apocalyptic number.

2128827991 is a deficient number, since it is larger than the sum of its proper divisors (14260649).

2128827991 is a wasteful number, since it uses less digits than its factorization.

2128827991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9173.

The product of its digits is 290304, while the sum is 49.

The square root of 2128827991 is about 46139.2239965087. The cubic root of 2128827991 is about 1286.4123199073.

The spelling of 2128827991 in words is "two billion, one hundred twenty-eight million, eight hundred twenty-seven thousand, nine hundred ninety-one".