28672111 has 4 divisors (see below), whose sum is σ = 30877672. Its totient is φ = 26466552.

The previous prime is 28672109. The next prime is 28672139. The reversal of 28672111 is 11127682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28672111 - 2¹ = 28672109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28672111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28672141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1102761 + ... + 1102786.

It is an arithmetic number, because the mean of its divisors is an integer number (7719418).

Almost surely, 2^28672111 is an apocalyptic number.

28672111 is a deficient number, since it is larger than the sum of its proper divisors (2205561).

28672111 is a wasteful number, since it uses less digits than its factorization.

28672111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205560.

The product of its digits is 1344, while the sum is 28.

The square root of 28672111 is about 5354.6345346811. The cubic root of 28672111 is about 306.0693842121.

Adding to 28672111 its reverse (11127682), we get a palindrome (39799793).

The spelling of 28672111 in words is "twenty-eight million, six hundred seventy-two thousand, one hundred eleven".