28287321018 has 32 divisors (see below), whose sum is σ = 63030942720. Its totient is φ = 8389533360.

The previous prime is 28287321017. The next prime is 28287321043. The reversal of 28287321018 is 81012378282.

It is not an unprimeable number, because it can be changed into a prime (28287321017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4556428 + ... + 4562631.

It is an arithmetic number, because the mean of its divisors is an integer number (1969716960).

Almost surely, 2^28287321018 is an apocalyptic number.

28287321018 is an abundant number, since it is smaller than the sum of its proper divisors (34743621702).

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

28287321018 is a wasteful number, since it uses less digits than its factorization.

28287321018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119122.

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 28287321018 in words is "twenty-eight billion, two hundred eighty-seven million, three hundred twenty-one thousand, eighteen".