28018816 has 32 divisors (see below), whose sum is σ = 63794880. Its totient is φ = 12007680.

The previous prime is 28018799. The next prime is 28018871. The reversal of 28018816 is 61881082.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14740 + ... + 16531.

It is an arithmetic number, because the mean of its divisors is an integer number (1993590).

Almost surely, 2^28018816 is an apocalyptic number.

It is an amenable number.

28018816 is an abundant number, since it is smaller than the sum of its proper divisors (35776064).

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

28018816 is an equidigital number, since it uses as much as digits as its factorization.

28018816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31292 (or 31280 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 28018816 is about 5293.2802684158. The cubic root of 28018816 is about 303.7269015498.

Adding to 28018816 its reverse (61881082), we get a palindrome (89899898).

The spelling of 28018816 in words is "twenty-eight million, eighteen thousand, eight hundred sixteen".