28326521 has 4 divisors (see below), whose sum is σ = 28344192. Its totient is φ = 28308852.

The previous prime is 28326503. The next prime is 28326553. The reversal of 28326521 is 12562382.

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 28326521 - 2⁶ = 28326457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28326581) 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, 6161 + ... + 9726.

It is an arithmetic number, because the mean of its divisors is an integer number (7086048).

Almost surely, 2^28326521 is an apocalyptic number.

It is an amenable number.

28326521 is a deficient number, since it is larger than the sum of its proper divisors (17671).

28326521 is a wasteful number, since it uses less digits than its factorization.

28326521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17670.

The product of its digits is 5760, while the sum is 29.

The square root of 28326521 is about 5322.2665284632. The cubic root of 28326521 is about 304.8347075347.

The spelling of 28326521 in words is "twenty-eight million, three hundred twenty-six thousand, five hundred twenty-one".