28266211 has 4 divisors (see below), whose sum is σ = 28314000. Its totient is φ = 28218424.

The previous prime is 28266197. The next prime is 28266221. The reversal of 28266211 is 11266282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11266282 = 2 ⋅5633141.

It is a cyclic number.

It is not a de Polignac number, because 28266211 - 2¹¹ = 28264163 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 28266211.

It is not an unprimeable number, because it can be changed into a prime (28266221) 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, 22996 + ... + 24193.

It is an arithmetic number, because the mean of its divisors is an integer number (7078500).

Almost surely, 2^28266211 is an apocalyptic number.

28266211 is a deficient number, since it is larger than the sum of its proper divisors (47789).

28266211 is an equidigital number, since it uses as much as digits as its factorization.

28266211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47788.

The product of its digits is 2304, while the sum is 28.

The square root of 28266211 is about 5316.5976902527. The cubic root of 28266211 is about 304.6182126087.

The spelling of 28266211 in words is "twenty-eight million, two hundred sixty-six thousand, two hundred eleven".