28079609 has 4 divisors (see below), whose sum is σ = 28090704. Its totient is φ = 28068516.

The previous prime is 28079603. The next prime is 28079651. The reversal of 28079609 is 90697082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28079609 - 2⁸ = 28079353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28079603) 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, 314 + ... + 7500.

It is an arithmetic number, because the mean of its divisors is an integer number (7022676).

Almost surely, 2^28079609 is an apocalyptic number.

It is an amenable number.

28079609 is a deficient number, since it is larger than the sum of its proper divisors (11095).

28079609 is an equidigital number, since it uses as much as digits as its factorization.

28079609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11094.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 28079609 is about 5299.0196263082. The cubic root of 28079609 is about 303.9464103655.

The spelling of 28079609 in words is "twenty-eight million, seventy-nine thousand, six hundred nine".