28380559 has 4 divisors (see below), whose sum is σ = 29040616. Its totient is φ = 27720504.

The previous prime is 28380557. The next prime is 28380571. The reversal of 28380559 is 95508382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28380559 - 2¹ = 28380557 is a prime.

It is a super-2 number, since 2×28380559² = 1610912258304962, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28380553) 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 3 ways as a sum of consecutive naturals, for example, 329964 + ... + 330049.

It is an arithmetic number, because the mean of its divisors is an integer number (7260154).

Almost surely, 2^28380559 is an apocalyptic number.

28380559 is a deficient number, since it is larger than the sum of its proper divisors (660057).

28380559 is an equidigital number, since it uses as much as digits as its factorization.

28380559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660056.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 28380559 is about 5327.3407062061. The cubic root of 28380559 is about 305.0284269840.

The spelling of 28380559 in words is "twenty-eight million, three hundred eighty thousand, five hundred fifty-nine".