28386329 has 4 divisors (see below), whose sum is σ = 28404276. Its totient is φ = 28368384.

The previous prime is 28386313. The next prime is 28386341. The reversal of 28386329 is 92368382.

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 14807104 + 13579225 = 3848^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 28386329 - 2⁴ = 28386313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28386529) 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, 6344 + ... + 9849.

It is an arithmetic number, because the mean of its divisors is an integer number (7101069).

Almost surely, 2^28386329 is an apocalyptic number.

It is an amenable number.

28386329 is a deficient number, since it is larger than the sum of its proper divisors (17947).

28386329 is a wasteful number, since it uses less digits than its factorization.

28386329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17946.

The product of its digits is 124416, while the sum is 41.

The square root of 28386329 is about 5327.8822246743. The cubic root of 28386329 is about 305.0490971755.

The spelling of 28386329 in words is "twenty-eight million, three hundred eighty-six thousand, three hundred twenty-nine".