28815361 has 4 divisors (see below), whose sum is σ = 28873152. Its totient is φ = 28757572.

The previous prime is 28815313. The next prime is 28815373. The reversal of 28815361 is 16351882.

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 a cyclic number.

It is not a de Polignac number, because 28815361 - 2⁷ = 28815233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28813361) 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, 28141 + ... + 29146.

It is an arithmetic number, because the mean of its divisors is an integer number (7218288).

Almost surely, 2^28815361 is an apocalyptic number.

It is an amenable number.

28815361 is a deficient number, since it is larger than the sum of its proper divisors (57791).

28815361 is an equidigital number, since it uses as much as digits as its factorization.

28815361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57790.

The product of its digits is 11520, while the sum is 34.

The square root of 28815361 is about 5367.9941318895. The cubic root of 28815361 is about 306.5782599343.

The spelling of 28815361 in words is "twenty-eight million, eight hundred fifteen thousand, three hundred sixty-one".