28815065 has 4 divisors (see below), whose sum is σ = 34578084. Its totient is φ = 23052048.

The previous prime is 28815043. The next prime is 28815079. The reversal of 28815065 is 56051882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2886601 + 25928464 = 1699^2 + 5092^2 .

It is a cyclic number.

It is not a de Polignac number, because 28815065 - 2⁸ = 28814809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2881502 + ... + 2881511.

It is an arithmetic number, because the mean of its divisors is an integer number (8644521).

Almost surely, 2^28815065 is an apocalyptic number.

It is an amenable number.

28815065 is a deficient number, since it is larger than the sum of its proper divisors (5763019).

28815065 is an equidigital number, since it uses as much as digits as its factorization.

28815065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763018.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 28815065 is about 5367.9665609987. The cubic root of 28815065 is about 306.5772101762.

The spelling of 28815065 in words is "twenty-eight million, eight hundred fifteen thousand, sixty-five".