28159945680 has 80 divisors (see below), whose sum is σ = 87351284160. Its totient is φ = 7504548864.

The previous prime is 28159945673. The next prime is 28159945717. The reversal of 28159945680 is 8654995182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 28159945680.

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 15 ways as a sum of consecutive naturals, for example, 349699 + ... + 422621.

It is an arithmetic number, because the mean of its divisors is an integer number (1091891052).

Almost surely, 2^28159945680 is an apocalyptic number.

28159945680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28159945680 is an abundant number, since it is smaller than the sum of its proper divisors (59191338480).

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

28159945680 is a wasteful number, since it uses less digits than its factorization.

28159945680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74548 (or 74542 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 57.

The spelling of 28159945680 in words is "twenty-eight billion, one hundred fifty-nine million, nine hundred forty-five thousand, six hundred eighty".