28721582688 has 96 divisors (see below), whose sum is σ = 81527814144. Its totient is φ = 8818952192.

The previous prime is 28721582663. The next prime is 28721582699. The reversal of 28721582688 is 88628512782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

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 15 ways as a sum of consecutive naturals, for example, 110520 + ... + 263927.

It is an arithmetic number, because the mean of its divisors is an integer number (849248064).

Almost surely, 2^28721582688 is an apocalyptic number.

It is an amenable number.

28721582688 is an abundant number, since it is smaller than the sum of its proper divisors (52806231456).

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

28721582688 is a wasteful number, since it uses less digits than its factorization.

28721582688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374524 (or 374516 counting only the distinct ones).

The product of its digits is 6881280, while the sum is 57.

The spelling of 28721582688 in words is "twenty-eight billion, seven hundred twenty-one million, five hundred eighty-two thousand, six hundred eighty-eight".