28039888 has 20 divisors (see below), whose sum is σ = 55094688. Its totient is φ = 13821920.

The previous prime is 28039883. The next prime is 28039889. The reversal of 28039888 is 88893082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28039883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11206 + ... + 13477.

Almost surely, 2^28039888 is an apocalyptic number.

It is an amenable number.

28039888 is a deficient number, since it is larger than the sum of its proper divisors (27054800).

28039888 is a wasteful number, since it uses less digits than its factorization.

28039888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24762 (or 24756 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 28039888 is about 5295.2703424849. The cubic root of 28039888 is about 303.8030233662.

The spelling of 28039888 in words is "twenty-eight million, thirty-nine thousand, eight hundred eighty-eight".