28086211 has 4 divisors (see below), whose sum is σ = 28099512. Its totient is φ = 28072912.

The previous prime is 28086209. The next prime is 28086221. The reversal of 28086211 is 11268082.

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 28086211 - 2¹ = 28086209 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 28086211.

It is not an unprimeable number, because it can be changed into a prime (28086221) 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, 2701 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (7024878).

Almost surely, 2^28086211 is an apocalyptic number.

28086211 is a deficient number, since it is larger than the sum of its proper divisors (13301).

28086211 is a wasteful number, since it uses less digits than its factorization.

28086211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13300.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 28086211 is about 5299.6425351150. The cubic root of 28086211 is about 303.9702295120.

The spelling of 28086211 in words is "twenty-eight million, eighty-six thousand, two hundred eleven".