28321268668 has 96 divisors (see below), whose sum is σ = 62787529728. Its totient is φ = 10857100800.

The previous prime is 28321268663. The next prime is 28321268669. The reversal of 28321268668 is 86686212382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321268663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14803680 + ... + 14805592.

It is an arithmetic number, because the mean of its divisors is an integer number (654036768).

Almost surely, 2^28321268668 is an apocalyptic number.

28321268668 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 28321268668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31393764864).

28321268668 is an abundant number, since it is smaller than the sum of its proper divisors (34466261060).

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

28321268668 is a wasteful number, since it uses less digits than its factorization.

28321268668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2681 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 52.

The spelling of 28321268668 in words is "twenty-eight billion, three hundred twenty-one million, two hundred sixty-eight thousand, six hundred sixty-eight".