28083989 has 8 divisors (see below), whose sum is σ = 29367360. Its totient is φ = 26805856.

The previous prime is 28083961. The next prime is 28084013. The reversal of 28083989 is 98938082.

It is a happy number.

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

It is not a de Polignac number, because 28083989 - 2⁸ = 28083733 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 (28083089) 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, 13202 + ... + 15180.

It is an arithmetic number, because the mean of its divisors is an integer number (3670920).

Almost surely, 2^28083989 is an apocalyptic number.

It is an amenable number.

28083989 is a deficient number, since it is larger than the sum of its proper divisors (1283371).

28083989 is a wasteful number, since it uses less digits than its factorization.

28083989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619.

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

The square root of 28083989 is about 5299.4328941878. The cubic root of 28083989 is about 303.9622132454.

The spelling of 28083989 in words is "twenty-eight million, eighty-three thousand, nine hundred eighty-nine".