28685776880 has 80 divisors (see below), whose sum is σ = 73052824320. Its totient is φ = 10426945536.

The previous prime is 28685776877. The next prime is 28685776901. The reversal of 28685776880 is 8867758682.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324224 + ... + 403103.

It is an arithmetic number, because the mean of its divisors is an integer number (913160304).

Almost surely, 2^28685776880 is an apocalyptic number.

28685776880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28685776880 is an abundant number, since it is smaller than the sum of its proper divisors (44367047440).

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

28685776880 is a wasteful number, since it uses less digits than its factorization.

28685776880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727386 (or 727380 counting only the distinct ones).

The product of its (nonzero) digits is 72253440, while the sum is 65.

The spelling of 28685776880 in words is "twenty-eight billion, six hundred eighty-five million, seven hundred seventy-six thousand, eight hundred eighty".