28644859 has 4 divisors (see below), whose sum is σ = 28747080. Its totient is φ = 28542640.

The previous prime is 28644829. The next prime is 28644883. The reversal of 28644859 is 95844682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28644859 - 2⁵ = 28644827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28644829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50689 + ... + 51250.

It is an arithmetic number, because the mean of its divisors is an integer number (7186770).

Almost surely, 2^28644859 is an apocalyptic number.

28644859 is a deficient number, since it is larger than the sum of its proper divisors (102221).

28644859 is a wasteful number, since it uses less digits than its factorization.

28644859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102220.

The product of its digits is 552960, while the sum is 46.

The square root of 28644859 is about 5352.0892182399. The cubic root of 28644859 is about 305.9723834846.

The spelling of 28644859 in words is "twenty-eight million, six hundred forty-four thousand, eight hundred fifty-nine".