28380509 has 8 divisors (see below), whose sum is σ = 30095040. Its totient is φ = 26688096.

The previous prime is 28380479. The next prime is 28380523. The reversal of 28380509 is 90508382.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28380509 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 (28386509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2849 + ... + 8054.

It is an arithmetic number, because the mean of its divisors is an integer number (3761880).

Almost surely, 2^28380509 is an apocalyptic number.

It is an amenable number.

28380509 is a deficient number, since it is larger than the sum of its proper divisors (1714531).

28380509 is a wasteful number, since it uses less digits than its factorization.

28380509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11059.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28380509 is about 5327.3360134311. The cubic root of 28380509 is about 305.0282478540.

The spelling of 28380509 in words is "twenty-eight million, three hundred eighty thousand, five hundred nine".