28389386928 has 40 divisors (see below), whose sum is σ = 83816286208. Its totient is φ = 8111253312.

The previous prime is 28389386897. The next prime is 28389386947. The reversal of 28389386928 is 82968398382.

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, 42245776 + ... + 42246447.

Almost surely, 2^28389386928 is an apocalyptic number.

28389386928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28389386928 is an abundant number, since it is smaller than the sum of its proper divisors (55426899280).

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

28389386928 is a wasteful number, since it uses less digits than its factorization.

28389386928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84492241 (or 84492235 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 66.

The spelling of 28389386928 in words is "twenty-eight billion, three hundred eighty-nine million, three hundred eighty-six thousand, nine hundred twenty-eight".