28111143 has 8 divisors (see below), whose sum is σ = 37712128. Its totient is φ = 18625464.

The previous prime is 28111133. The next prime is 28111151. The reversal of 28111143 is 34111182.

It is a happy number.

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

It is not a de Polignac number, because 28111143 - 2⁹ = 28110631 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 (28111103) 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, 28255 + ... + 29232.

It is an arithmetic number, because the mean of its divisors is an integer number (4714016).

Almost surely, 2^28111143 is an apocalyptic number.

28111143 is a deficient number, since it is larger than the sum of its proper divisors (9600985).

28111143 is a wasteful number, since it uses less digits than its factorization.

28111143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57653.

The product of its digits is 192, while the sum is 21.

The square root of 28111143 is about 5301.9942474507. The cubic root of 28111143 is about 304.0601472344.

The spelling of 28111143 in words is "twenty-eight million, one hundred eleven thousand, one hundred forty-three".