28775065 has 16 divisors (see below), whose sum is σ = 37786176. Its totient is φ = 20862400.

The previous prime is 28775059. The next prime is 28775077. The reversal of 28775065 is 56057782.

It is not a de Polignac number, because 28775065 - 2³ = 28775057 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23775 + ... + 24955.

It is an arithmetic number, because the mean of its divisors is an integer number (2361636).

Almost surely, 2^28775065 is an apocalyptic number.

It is an amenable number.

28775065 is a deficient number, since it is larger than the sum of its proper divisors (9011111).

28775065 is a wasteful number, since it uses less digits than its factorization.

28775065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 28775065 is about 5364.2394614707. The cubic root of 28775065 is about 306.4352847959.

The spelling of 28775065 in words is "twenty-eight million, seven hundred seventy-five thousand, sixty-five".