28550111 has 4 divisors (see below), whose sum is σ = 28642224. Its totient is φ = 28458000.

The previous prime is 28550099. The next prime is 28550201. The reversal of 28550111 is 11105582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11105582 = 2 ⋅5552791.

It is a cyclic number.

It is not a de Polignac number, because 28550111 - 2¹⁴ = 28533727 is a prime.

It is a super-2 number, since 2×28550111² = 1630217676224642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28550311) 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 3 ways as a sum of consecutive naturals, for example, 45590 + ... + 46211.

It is an arithmetic number, because the mean of its divisors is an integer number (7160556).

Almost surely, 2^28550111 is an apocalyptic number.

28550111 is a deficient number, since it is larger than the sum of its proper divisors (92113).

28550111 is an equidigital number, since it uses as much as digits as its factorization.

28550111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92112.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 28550111 is about 5343.2303899420. The cubic root of 28550111 is about 305.6346580337.

Adding to 28550111 its reverse (11105582), we get a palindrome (39655693).

The spelling of 28550111 in words is "twenty-eight million, five hundred fifty thousand, one hundred eleven".