28455809 has 8 divisors (see below), whose sum is σ = 29288160. Its totient is φ = 27631296.

The previous prime is 28455743. The next prime is 28455839. The reversal of 28455809 is 90855482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28455809 - 2²⁴ = 11678593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28455839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5849 + ... + 9545.

It is an arithmetic number, because the mean of its divisors is an integer number (3661020).

Almost surely, 2^28455809 is an apocalyptic number.

It is an amenable number.

28455809 is a deficient number, since it is larger than the sum of its proper divisors (832351).

28455809 is a wasteful number, since it uses less digits than its factorization.

28455809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 28455809 is about 5334.3986540190. The cubic root of 28455809 is about 305.2977795865.

The spelling of 28455809 in words is "twenty-eight million, four hundred fifty-five thousand, eight hundred nine".