28873218 has 16 divisors (see below), whose sum is σ = 62996256. Its totient is φ = 8749440.

The previous prime is 28873213. The next prime is 28873223. The reversal of 28873218 is 81237882.

It is an interprime number because it is at equal distance from previous prime (28873213) and next prime (28873223).

It is not an unprimeable number, because it can be changed into a prime (28873213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218671 + ... + 218802.

It is an arithmetic number, because the mean of its divisors is an integer number (3937266).

Almost surely, 2^28873218 is an apocalyptic number.

28873218 is an abundant number, since it is smaller than the sum of its proper divisors (34123038).

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

28873218 is a wasteful number, since it uses less digits than its factorization.

28873218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437489.

The product of its digits is 43008, while the sum is 39.

The square root of 28873218 is about 5373.3805002066. The cubic root of 28873218 is about 306.7833107525.

It can be divided in two parts, 2887 and 3218, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 28873218 in words is "twenty-eight million, eight hundred seventy-three thousand, two hundred eighteen".