28684518 has 32 divisors (see below), whose sum is σ = 58767072. Its totient is φ = 9331200.

The previous prime is 28684511. The next prime is 28684529. The reversal of 28684518 is 81548682.

It is a self number, because there is not a number n which added to its sum of digits gives 28684518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66030 + ... + 66462.

It is an arithmetic number, because the mean of its divisors is an integer number (1836471).

Almost surely, 2^28684518 is an apocalyptic number.

28684518 is an abundant number, since it is smaller than the sum of its proper divisors (30082554).

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

28684518 is a wasteful number, since it uses less digits than its factorization.

28684518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680.

The product of its digits is 122880, while the sum is 42.

The square root of 28684518 is about 5355.7929384919. The cubic root of 28684518 is about 306.1135253085.

The spelling of 28684518 in words is "twenty-eight million, six hundred eighty-four thousand, five hundred eighteen".