28665105 has 16 divisors (see below), whose sum is σ = 52416384. Its totient is φ = 13104000.

The previous prime is 28665101. The next prime is 28665139. The reversal of 28665105 is 50156682.

It is not a de Polignac number, because 28665105 - 2² = 28665101 is a prime.

It is a super-2 number, since 2×28665105² = 1643376489322050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28665101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136396 + ... + 136605.

It is an arithmetic number, because the mean of its divisors is an integer number (3276024).

Almost surely, 2^28665105 is an apocalyptic number.

It is an amenable number.

28665105 is a deficient number, since it is larger than the sum of its proper divisors (23751279).

28665105 is a wasteful number, since it uses less digits than its factorization.

28665105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273016.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 28665105 is about 5353.9802950702. The cubic root of 28665105 is about 306.0444529379.

The spelling of 28665105 in words is "twenty-eight million, six hundred sixty-five thousand, one hundred five".