28140111 has 6 divisors (see below), whose sum is σ = 40646840. Its totient is φ = 18760068.

The previous prime is 28140097. The next prime is 28140131. The reversal of 28140111 is 11104182.

It is not a de Polignac number, because 28140111 - 2⁷ = 28139983 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 (28140131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1563331 + ... + 1563348.

Almost surely, 2^28140111 is an apocalyptic number.

28140111 is a deficient number, since it is larger than the sum of its proper divisors (12506729).

28140111 is a wasteful number, since it uses less digits than its factorization.

28140111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126685 (or 3126682 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 28140111 is about 5304.7253463304. The cubic root of 28140111 is about 304.1645541189.

Adding to 28140111 its reverse (11104182), we get a palindrome (39244293).

The spelling of 28140111 in words is "twenty-eight million, one hundred forty thousand, one hundred eleven".