28117045928 has 32 divisors (see below), whose sum is σ = 54021764160. Its totient is φ = 13711451520.

The previous prime is 28117045897. The next prime is 28117045933. The reversal of 28117045928 is 82954071182.

It is a super-3 number, since 3×28117045928³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1250675 + ... + 1272957.

It is an arithmetic number, because the mean of its divisors is an integer number (1688180130).

Almost surely, 2^28117045928 is an apocalyptic number.

It is an amenable number.

28117045928 is a deficient number, since it is larger than the sum of its proper divisors (25904718232).

28117045928 is a wasteful number, since it uses less digits than its factorization.

28117045928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26177 (or 26173 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 28117045928 in words is "twenty-eight billion, one hundred seventeen million, forty-five thousand, nine hundred twenty-eight".