28644858 has 24 divisors (see below), whose sum is σ = 67706496. Its totient is φ = 8680200.

The previous prime is 28644829. The next prime is 28644883. The reversal of 28644858 is 85844682.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72138 + ... + 72533.

It is an arithmetic number, because the mean of its divisors is an integer number (2821104).

Almost surely, 2^28644858 is an apocalyptic number.

28644858 is an abundant number, since it is smaller than the sum of its proper divisors (39061638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28644858 is a wasteful number, since it uses less digits than its factorization.

28644858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144690 (or 144687 counting only the distinct ones).

The product of its digits is 491520, while the sum is 45.

The square root of 28644858 is about 5352.0891248185. The cubic root of 28644858 is about 305.9723799241.

The spelling of 28644858 in words is "twenty-eight million, six hundred forty-four thousand, eight hundred fifty-eight".