28382513 has 4 divisors (see below), whose sum is σ = 28429428. Its totient is φ = 28335600.

The previous prime is 28382479. The next prime is 28382539. The reversal of 28382513 is 31528382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31528382 = 2 ⋅15764191.

It can be written as a sum of positive squares in 2 ways, for example, as 2900209 + 25482304 = 1703^2 + 5048^2 .

It is a cyclic number.

It is not a de Polignac number, because 28382513 - 2⁶ = 28382449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28382513.

It is not an unprimeable number, because it can be changed into a prime (28382573) 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, 22538 + ... + 23763.

It is an arithmetic number, because the mean of its divisors is an integer number (7107357).

Almost surely, 2^28382513 is an apocalyptic number.

It is an amenable number.

28382513 is a deficient number, since it is larger than the sum of its proper divisors (46915).

28382513 is an equidigital number, since it uses as much as digits as its factorization.

28382513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46914.

The product of its digits is 11520, while the sum is 32.

The square root of 28382513 is about 5327.5240966137. The cubic root of 28382513 is about 305.0354272205.

The spelling of 28382513 in words is "twenty-eight million, three hundred eighty-two thousand, five hundred thirteen".