28505455 has 16 divisors (see below), whose sum is σ = 38229408. Its totient is φ = 20224000.

The previous prime is 28505423. The next prime is 28505459. The reversal of 28505455 is 55450582.

It is not a de Polignac number, because 28505455 - 2⁵ = 28505423 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 28505455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505459) by changing a digit.

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, 4066 + ... + 8575.

It is an arithmetic number, because the mean of its divisors is an integer number (2389338).

Almost surely, 2^28505455 is an apocalyptic number.

28505455 is a deficient number, since it is larger than the sum of its proper divisors (9723953).

28505455 is a wasteful number, since it uses less digits than its factorization.

28505455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12698.

The product of its (nonzero) digits is 40000, while the sum is 34.

The square root of 28505455 is about 5339.0500091308. The cubic root of 28505455 is about 305.4752244045.

The spelling of 28505455 in words is "twenty-eight million, five hundred five thousand, four hundred fifty-five".