28555871556840 has 64 divisors (see below), whose sum is σ = 86874200818560. Its totient is φ = 7507646979840.

The previous prime is 28555871556811. The next prime is 28555871556893. The reversal of 28555871556840 is 4865517855582.

28555871556840 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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, 1675805539 + ... + 1675822578.

It is an arithmetic number, because the mean of its divisors is an integer number (1357409387790).

Almost surely, 2^{28555871556840} is an apocalyptic number.

28555871556840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28555871556840 is an abundant number, since it is smaller than the sum of its proper divisors (58318329261720).

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

28555871556840 is a wasteful number, since it uses less digits than its factorization.

28555871556840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351628202 (or 3351628198 counting only the distinct ones).

The product of its (nonzero) digits is 537600000, while the sum is 69.

The spelling of 28555871556840 in words is "twenty-eight trillion, five hundred fifty-five billion, eight hundred seventy-one million, five hundred fifty-six thousand, eight hundred forty".