28111423237 has 4 divisors (see below), whose sum is σ = 28111865760. Its totient is φ = 28110980716.

The previous prime is 28111423187. The next prime is 28111423297. The reversal of 28111423237 is 73232411182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28111423237 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 (28111423297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105937 + ... + 259702.

It is an arithmetic number, because the mean of its divisors is an integer number (7027966440).

Almost surely, 2^28111423237 is an apocalyptic number.

It is an amenable number.

28111423237 is a deficient number, since it is larger than the sum of its proper divisors (442523).

28111423237 is an equidigital number, since it uses as much as digits as its factorization.

28111423237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442522.

The product of its digits is 16128, while the sum is 34.

The spelling of 28111423237 in words is "twenty-eight billion, one hundred eleven million, four hundred twenty-three thousand, two hundred thirty-seven".