28644805 has 16 divisors (see below), whose sum is σ = 39533184. Its totient is φ = 19517760.

The previous prime is 28644797. The next prime is 28644817. The reversal of 28644805 is 50844682.

It is not a de Polignac number, because 28644805 - 2³ = 28644797 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 15 ways as a sum of consecutive naturals, for example, 3195 + ... + 8215.

It is an arithmetic number, because the mean of its divisors is an integer number (2470824).

Almost surely, 2^28644805 is an apocalyptic number.

It is an amenable number.

28644805 is a deficient number, since it is larger than the sum of its proper divisors (10888379).

28644805 is a wasteful number, since it uses less digits than its factorization.

28644805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 28644805 is about 5352.0841734786. The cubic root of 28644805 is about 305.9721912160.

The spelling of 28644805 in words is "twenty-eight million, six hundred forty-four thousand, eight hundred five".