28030389 has 8 divisors (see below), whose sum is σ = 37403520. Its totient is φ = 18672096.

The previous prime is 28030363. The next prime is 28030393. The reversal of 28030389 is 98303082.

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

It is not a de Polignac number, because 28030389 - 2⁵ = 28030357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28030319) 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, 1924 + ... + 7730.

It is an arithmetic number, because the mean of its divisors is an integer number (4675440).

Almost surely, 2^28030389 is an apocalyptic number.

It is an amenable number.

28030389 is a deficient number, since it is larger than the sum of its proper divisors (9373131).

28030389 is a wasteful number, since it uses less digits than its factorization.

28030389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7419.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28030389 is about 5294.3733340217. The cubic root of 28030389 is about 303.7687133046.

The spelling of 28030389 in words is "twenty-eight million, thirty thousand, three hundred eighty-nine".