28384361 has 4 divisors (see below), whose sum is σ = 28434132. Its totient is φ = 28334592.

The previous prime is 28384303. The next prime is 28384379. The reversal of 28384361 is 16348382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24157225 + 4227136 = 4915^2 + 2056^2 .

It is a cyclic number.

It is not a de Polignac number, because 28384361 - 2⁶ = 28384297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28384861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24020 + ... + 25173.

It is an arithmetic number, because the mean of its divisors is an integer number (7108533).

Almost surely, 2^28384361 is an apocalyptic number.

It is an amenable number.

28384361 is a deficient number, since it is larger than the sum of its proper divisors (49771).

28384361 is an equidigital number, since it uses as much as digits as its factorization.

28384361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49770.

The product of its digits is 27648, while the sum is 35.

The square root of 28384361 is about 5327.6975327058. The cubic root of 28384361 is about 305.0420474146.

The spelling of 28384361 in words is "twenty-eight million, three hundred eighty-four thousand, three hundred sixty-one".