28326321 has 16 divisors (see below), whose sum is σ = 44174400. Its totient is φ = 17889984.

The previous prime is 28326299. The next prime is 28326329. The reversal of 28326321 is 12362382.

28326321 is a `hidden beast` number, since 28 + 3 + 2 + 632 + 1 = 666.

It is not a de Polignac number, because 28326321 - 2¹¹ = 28324273 is a prime.

It is a super-2 number, since 2×28326321² = 1604760922790082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28326329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27096 + ... + 28121.

It is an arithmetic number, because the mean of its divisors is an integer number (2760900).

Almost surely, 2^28326321 is an apocalyptic number.

It is an amenable number.

28326321 is a deficient number, since it is larger than the sum of its proper divisors (15848079).

28326321 is a wasteful number, since it uses less digits than its factorization.

28326321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55245 (or 55239 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 28326321 is about 5322.2477394424. The cubic root of 28326321 is about 304.8339901024.

The spelling of 28326321 in words is "twenty-eight million, three hundred twenty-six thousand, three hundred twenty-one".