28800389 has 4 divisors (see below), whose sum is σ = 28819980. Its totient is φ = 28780800.

The previous prime is 28800377. The next prime is 28800403. The reversal of 28800389 is 98300882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98300882 = 2 ⋅49150441.

It can be written as a sum of positive squares in 2 ways, for example, as 26697889 + 2102500 = 5167^2 + 1450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28800389 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 (28805389) 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, 7394 + ... + 10595.

It is an arithmetic number, because the mean of its divisors is an integer number (7204995).

Almost surely, 2^28800389 is an apocalyptic number.

It is an amenable number.

28800389 is a deficient number, since it is larger than the sum of its proper divisors (19591).

28800389 is a wasteful number, since it uses less digits than its factorization.

28800389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19590.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 28800389 is about 5366.5993888122. The cubic root of 28800389 is about 306.5251530177.

The spelling of 28800389 in words is "twenty-eight million, eight hundred thousand, three hundred eighty-nine".