28648565 has 12 divisors (see below), whose sum is σ = 37788492. Its totient is φ = 20834880.

The previous prime is 28648531. The next prime is 28648573. The reversal of 28648565 is 56584682.

It can be written as a sum of positive squares in 2 ways, for example, as 5541316 + 23107249 = 2354^2 + 4807^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28648565 is a prime.

It is a Duffinian number.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 23072 + ... + 24281.

It is an arithmetic number, because the mean of its divisors is an integer number (3149041).

Almost surely, 2^28648565 is an apocalyptic number.

It is an amenable number.

28648565 is a deficient number, since it is larger than the sum of its proper divisors (9139927).

28648565 is a wasteful number, since it uses less digits than its factorization.

28648565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47380 (or 47369 counting only the distinct ones).

The product of its digits is 460800, while the sum is 44.

The square root of 28648565 is about 5352.4354269809. The cubic root of 28648565 is about 305.9855782287.

The spelling of 28648565 in words is "twenty-eight million, six hundred forty-eight thousand, five hundred sixty-five".