28991127 has 16 divisors (see below), whose sum is σ = 42647040. Its totient is φ = 17371200.

The previous prime is 28991089. The next prime is 28991129. The reversal of 28991127 is 72119982.

It is not a de Polignac number, because 28991127 - 2²² = 24796823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28991129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1999 + ... + 7872.

It is an arithmetic number, because the mean of its divisors is an integer number (2665440).

Almost surely, 2^28991127 is an apocalyptic number.

28991127 is a deficient number, since it is larger than the sum of its proper divisors (13655913).

28991127 is a wasteful number, since it uses less digits than its factorization.

28991127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9974.

The product of its digits is 18144, while the sum is 39.

The square root of 28991127 is about 5384.3409067406. The cubic root of 28991127 is about 307.2003452721.

The spelling of 28991127 in words is "twenty-eight million, nine hundred ninety-one thousand, one hundred twenty-seven".