28038989 has 8 divisors (see below), whose sum is σ = 30724320. Its totient is φ = 25376400.

The previous prime is 28038979. The next prime is 28039013. The reversal of 28038989 is 98983082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28038989 - 2⁸ = 28038733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28038929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3047 + ... + 8084.

It is an arithmetic number, because the mean of its divisors is an integer number (3840540).

Almost surely, 2^28038989 is an apocalyptic number.

It is an amenable number.

28038989 is a deficient number, since it is larger than the sum of its proper divisors (2685331).

28038989 is a wasteful number, since it uses less digits than its factorization.

28038989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11371.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 28038989 is about 5295.1854547315. The cubic root of 28038989 is about 303.7997765411.

The spelling of 28038989 in words is "twenty-eight million, thirty-eight thousand, nine hundred eighty-nine".