28980878688 has 72 divisors (see below), whose sum is σ = 82939435488. Its totient is φ = 9598747392.

The previous prime is 28980878687. The next prime is 28980878701. The reversal of 28980878688 is 88687808982.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28980878681) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 275256 + ... + 365687.

It is an arithmetic number, because the mean of its divisors is an integer number (1151936604).

Almost surely, 2^28980878688 is an apocalyptic number.

It is an amenable number.

28980878688 is an abundant number, since it is smaller than the sum of its proper divisors (53958556800).

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

28980878688 is a wasteful number, since it uses less digits than its factorization.

28980878688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641116 (or 641105 counting only the distinct ones).

The product of its (nonzero) digits is 198180864, while the sum is 72.

The spelling of 28980878688 in words is "twenty-eight billion, nine hundred eighty million, eight hundred seventy-eight thousand, six hundred eighty-eight".