28655565 has 16 divisors (see below), whose sum is σ = 46534848. Its totient is φ = 15054336.

The previous prime is 28655503. The next prime is 28655581. The reversal of 28655565 is 56555682.

It is not a de Polignac number, because 28655565 - 2⁷ = 28655437 is a prime.

It is a super-2 number, since 2×28655565² = 1642282810938450, which contains 22 as substring.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 13252 + ... + 15261.

It is an arithmetic number, because the mean of its divisors is an integer number (2908428).

Almost surely, 2^28655565 is an apocalyptic number.

It is an amenable number.

28655565 is a deficient number, since it is larger than the sum of its proper divisors (17879283).

28655565 is a wasteful number, since it uses less digits than its factorization.

28655565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28588.

The product of its digits is 360000, while the sum is 42.

The square root of 28655565 is about 5353.0892949772. The cubic root of 28655565 is about 306.0104977389.

The spelling of 28655565 in words is "twenty-eight million, six hundred fifty-five thousand, five hundred sixty-five".