28516165 has 4 divisors (see below), whose sum is σ = 34219404. Its totient is φ = 22812928.

The previous prime is 28516153. The next prime is 28516217. The reversal of 28516165 is 56161582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56161582 = 2 ⋅28080791.

It can be written as a sum of positive squares in 2 ways, for example, as 15792676 + 12723489 = 3974^2 + 3567^2 .

It is a cyclic number.

It is not a de Polignac number, because 28516165 - 2⁵ = 28516133 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 28516165.

It is a congruent 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, 2851612 + ... + 2851621.

It is an arithmetic number, because the mean of its divisors is an integer number (8554851).

Almost surely, 2^28516165 is an apocalyptic number.

It is an amenable number.

28516165 is a deficient number, since it is larger than the sum of its proper divisors (5703239).

28516165 is an equidigital number, since it uses as much as digits as its factorization.

28516165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5703238.

The product of its digits is 14400, while the sum is 34.

The square root of 28516165 is about 5340.0529023597. The cubic root of 28516165 is about 305.5134770828.

The spelling of 28516165 in words is "twenty-eight million, five hundred sixteen thousand, one hundred sixty-five".