28330513 has 4 divisors (see below), whose sum is σ = 28365120. Its totient is φ = 28295908.

The previous prime is 28330447. The next prime is 28330529. The reversal of 28330513 is 31503382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31503382 = 2 ⋅15751691.

It is a cyclic number.

It is not a de Polignac number, because 28330513 - 2¹⁷ = 28199441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28330573) 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, 16045 + ... + 17722.

It is an arithmetic number, because the mean of its divisors is an integer number (7091280).

Almost surely, 2^28330513 is an apocalyptic number.

It is an amenable number.

28330513 is a deficient number, since it is larger than the sum of its proper divisors (34607).

28330513 is an equidigital number, since it uses as much as digits as its factorization.

28330513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34606.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 28330513 is about 5322.6415434444. The cubic root of 28330513 is about 304.8490267775.

Adding to 28330513 its reverse (31503382), we get a palindrome (59833895).

The spelling of 28330513 in words is "twenty-eight million, three hundred thirty thousand, five hundred thirteen".