28691820888 has 32 divisors (see below), whose sum is σ = 72002304000. Its totient is φ = 9527573408.

The previous prime is 28691820881. The next prime is 28691820889. The reversal of 28691820888 is 88802819682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28691820881) by changing a digit.

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, 2266488 + ... + 2279111.

It is an arithmetic number, because the mean of its divisors is an integer number (2250072000).

Almost surely, 2^28691820888 is an apocalyptic number.

It is an amenable number.

28691820888 is an abundant number, since it is smaller than the sum of its proper divisors (43310483112).

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

28691820888 is a wasteful number, since it uses less digits than its factorization.

28691820888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545871 (or 4545867 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 60.

The spelling of 28691820888 in words is "twenty-eight billion, six hundred ninety-one million, eight hundred twenty thousand, eight hundred eighty-eight".