28371513 has 4 divisors (see below), whose sum is σ = 37828688. Its totient is φ = 18914340.

The previous prime is 28371493. The next prime is 28371533. The reversal of 28371513 is 31517382.

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.

It is an interprime number because it is at equal distance from previous prime (28371493) and next prime (28371533).

It is not a de Polignac number, because 28371513 - 2⁶ = 28371449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28371533) 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, 4728583 + ... + 4728588.

It is an arithmetic number, because the mean of its divisors is an integer number (9457172).

Almost surely, 2^28371513 is an apocalyptic number.

It is an amenable number.

28371513 is a deficient number, since it is larger than the sum of its proper divisors (9457175).

28371513 is an equidigital number, since it uses as much as digits as its factorization.

28371513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9457174.

The product of its digits is 5040, while the sum is 30.

The square root of 28371513 is about 5326.4916220717. The cubic root of 28371513 is about 304.9960153560.

Adding to 28371513 its reverse (31517382), we get a palindrome (59888895).

The spelling of 28371513 in words is "twenty-eight million, three hundred seventy-one thousand, five hundred thirteen".