28080989 has 4 divisors (see below), whose sum is σ = 28107420. Its totient is φ = 28054560.

The previous prime is 28080979. The next prime is 28081007. The reversal of 28080989 is 98908082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9504889 + 18576100 = 3083^2 + 4310^2 .

It is a cyclic number.

It is not a de Polignac number, because 28080989 - 2⁸ = 28080733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28080979) 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, 11552 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (7026855).

Almost surely, 2^28080989 is an apocalyptic number.

It is an amenable number.

28080989 is a deficient number, since it is larger than the sum of its proper divisors (26431).

28080989 is a wasteful number, since it uses less digits than its factorization.

28080989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26430.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 28080989 is about 5299.1498374739. The cubic root of 28080989 is about 303.9513895324.

The spelling of 28080989 in words is "twenty-eight million, eighty thousand, nine hundred eighty-nine".