28684345 has 4 divisors (see below), whose sum is σ = 34421220. Its totient is φ = 22947472.

The previous prime is 28684333. The next prime is 28684349. The reversal of 28684345 is 54348682.

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 17952169 + 10732176 = 4237^2 + 3276^2 .

It is a cyclic number.

It is not a de Polignac number, because 28684345 - 2⁹ = 28683833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28684298 and 28684307.

It is not an unprimeable number, because it can be changed into a prime (28684349) 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, 2868430 + ... + 2868439.

It is an arithmetic number, because the mean of its divisors is an integer number (8605305).

Almost surely, 2^28684345 is an apocalyptic number.

It is an amenable number.

28684345 is a deficient number, since it is larger than the sum of its proper divisors (5736875).

28684345 is an equidigital number, since it uses as much as digits as its factorization.

28684345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736874.

The product of its digits is 184320, while the sum is 40.

The square root of 28684345 is about 5355.7767877312. The cubic root of 28684345 is about 306.1129099040.

The spelling of 28684345 in words is "twenty-eight million, six hundred eighty-four thousand, three hundred forty-five".