28380199 has 4 divisors (see below), whose sum is σ = 28504360. Its totient is φ = 28256040.

The previous prime is 28380173. The next prime is 28380203. The reversal of 28380199 is 99108382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99108382 = 2 ⋅49554191.

It is a cyclic number.

It is not a de Polignac number, because 28380199 - 2¹⁷ = 28249127 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 (28380139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61737 + ... + 62194.

It is an arithmetic number, because the mean of its divisors is an integer number (7126090).

Almost surely, 2^28380199 is an apocalyptic number.

28380199 is a deficient number, since it is larger than the sum of its proper divisors (124161).

28380199 is a wasteful number, since it uses less digits than its factorization.

28380199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124160.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 28380199 is about 5327.3069181342. The cubic root of 28380199 is about 305.0271372432.

The spelling of 28380199 in words is "twenty-eight million, three hundred eighty thousand, one hundred ninety-nine".