28889907506808 has 64 divisors (see below), whose sum is σ = 72436327004160. Its totient is φ = 9601772105856.

The previous prime is 28889907506791. The next prime is 28889907506819. The reversal of 28889907506808 is 80860570998882.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43206166 + ... + 43869722.

It is an arithmetic number, because the mean of its divisors is an integer number (1131817609440).

Almost surely, 2^{28889907506808} is an apocalyptic number.

It is an amenable number.

28889907506808 is an abundant number, since it is smaller than the sum of its proper divisors (43546419497352).

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

28889907506808 is a wasteful number, since it uses less digits than its factorization.

28889907506808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668876 (or 668872 counting only the distinct ones).

The product of its (nonzero) digits is 1114767360, while the sum is 78.

The spelling of 28889907506808 in words is "twenty-eight trillion, eight hundred eighty-nine billion, nine hundred seven million, five hundred six thousand, eight hundred eight".