28261814868 has 144 divisors (see below), whose sum is σ = 86314233600. Its totient is φ = 7972473600.

The previous prime is 28261814843. The next prime is 28261814881. The reversal of 28261814868 is 86841816282.

28261814868 is a `hidden beast` number, since 2 + 8 + 2 + 618 + 14 + 8 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 384268 + ... + 451868.

It is an arithmetic number, because the mean of its divisors is an integer number (599404400).

Almost surely, 2^28261814868 is an apocalyptic number.

28261814868 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 28261814868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43157116800).

28261814868 is an abundant number, since it is smaller than the sum of its proper divisors (58052418732).

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

28261814868 is a wasteful number, since it uses less digits than its factorization.

28261814868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67707 (or 67692 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 54.

The spelling of 28261814868 in words is "twenty-eight billion, two hundred sixty-one million, eight hundred fourteen thousand, eight hundred sixty-eight".