28326309 has 8 divisors (see below), whose sum is σ = 41201952. Its totient is φ = 17167440.

The previous prime is 28326299. The next prime is 28326329. The reversal of 28326309 is 90362382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28326309 - 2¹² = 28322213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 858373 = 28326309 / (2 + 8 + 3 + 2 + 6 + 3 + 0 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 28326309.

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 7 ways as a sum of consecutive naturals, for example, 429154 + ... + 429219.

It is an arithmetic number, because the mean of its divisors is an integer number (5150244).

Almost surely, 2^28326309 is an apocalyptic number.

It is an amenable number.

28326309 is a deficient number, since it is larger than the sum of its proper divisors (12875643).

28326309 is a wasteful number, since it uses less digits than its factorization.

28326309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858387.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 28326309 is about 5322.2466120991. The cubic root of 28326309 is about 304.8339470564.

It can be divided in two parts, 283 and 26309, that multiplied together give a palindrome (7445447).

The spelling of 28326309 in words is "twenty-eight million, three hundred twenty-six thousand, three hundred nine".