28266115 has 4 divisors (see below), whose sum is σ = 33919344. Its totient is φ = 22612888.

The previous prime is 28266107. The next prime is 28266127. The reversal of 28266115 is 51166282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51166282 = 2 ⋅25583141.

It is a cyclic number.

It is not a de Polignac number, because 28266115 - 2³ = 28266107 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2826607 + ... + 2826616.

It is an arithmetic number, because the mean of its divisors is an integer number (8479836).

Almost surely, 2^28266115 is an apocalyptic number.

28266115 is a deficient number, since it is larger than the sum of its proper divisors (5653229).

28266115 is an equidigital number, since it uses as much as digits as its factorization.

28266115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5653228.

The product of its digits is 5760, while the sum is 31.

The square root of 28266115 is about 5316.5886619147. The cubic root of 28266115 is about 304.6178677520.

The spelling of 28266115 in words is "twenty-eight million, two hundred sixty-six thousand, one hundred fifteen".