28287147868 has 72 divisors (see below), whose sum is σ = 59666332320. Its totient is φ = 11686147200.

The previous prime is 28287147853. The next prime is 28287147881. The reversal of 28287147868 is 86874178282.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3844393 + ... + 3851743.

It is an arithmetic number, because the mean of its divisors is an integer number (828699060).

Almost surely, 2^28287147868 is an apocalyptic number.

28287147868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28287147868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29833166160).

28287147868 is an abundant number, since it is smaller than the sum of its proper divisors (31379184452).

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

28287147868 is a wasteful number, since it uses less digits than its factorization.

28287147868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075 (or 8066 counting only the distinct ones).

The product of its digits is 19267584, while the sum is 61.

The spelling of 28287147868 in words is "twenty-eight billion, two hundred eighty-seven million, one hundred forty-seven thousand, eight hundred sixty-eight".