28389912 has 32 divisors (see below), whose sum is σ = 74062080. Its totient is φ = 9051680.

The previous prime is 28389887. The next prime is 28389923. The reversal of 28389912 is 21998382.

It is a congruent number.

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, 25164 + ... + 26267.

It is an arithmetic number, because the mean of its divisors is an integer number (2314440).

Almost surely, 2^28389912 is an apocalyptic number.

It is an amenable number.

28389912 is an abundant number, since it is smaller than the sum of its proper divisors (45672168).

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

28389912 is a wasteful number, since it uses less digits than its factorization.

28389912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51463 (or 51459 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 28389912 is about 5328.2184639896. The cubic root of 28389912 is about 305.0619313457.

The spelling of 28389912 in words is "twenty-eight million, three hundred eighty-nine thousand, nine hundred twelve".