28681356768 has 48 divisors (see below), whose sum is σ = 75308441040. Its totient is φ = 9557927936.

The previous prime is 28681356733. The next prime is 28681356793. The reversal of 28681356768 is 86765318682.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 345496 + ... + 420392.

It is an arithmetic number, because the mean of its divisors is an integer number (1568925855).

Almost surely, 2^28681356768 is an apocalyptic number.

It is an amenable number.

28681356768 is an abundant number, since it is smaller than the sum of its proper divisors (46627084272).

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

28681356768 is a wasteful number, since it uses less digits than its factorization.

28681356768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78899 (or 78891 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 60.

The spelling of 28681356768 in words is "twenty-eight billion, six hundred eighty-one million, three hundred fifty-six thousand, seven hundred sixty-eight".