28120888291 has 6 divisors (see below), whose sum is σ = 29396694740. Its totient is φ = 26898240468.

The previous prime is 28120888277. The next prime is 28120888319. The reversal of 28120888291 is 19288802182.

It is not a de Polignac number, because 28120888291 - 2⁹ = 28120887779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28120888261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26578761 + ... + 26579818.

Almost surely, 2^28120888291 is an apocalyptic number.

28120888291 is a deficient number, since it is larger than the sum of its proper divisors (1275806449).

28120888291 is an equidigital number, since it uses as much as digits as its factorization.

28120888291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53158625 (or 53158602 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 49.

The spelling of 28120888291 in words is "twenty-eight billion, one hundred twenty million, eight hundred eighty-eight thousand, two hundred ninety-one".