28484609 has 4 divisors (see below), whose sum is σ = 28508160. Its totient is φ = 28461060.

The previous prime is 28484597. The next prime is 28484611. The reversal of 28484609 is 90648482.

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 an emirpimes, since its reverse is a distinct semiprime: 90648482 = 2 ⋅45324241.

It is a cyclic number.

It is not a de Polignac number, because 28484609 - 2⁴ = 28484593 is a prime.

It is a super-2 number, since 2×28484609² = 1622745899765762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28484909) 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, 9857 + ... + 12414.

It is an arithmetic number, because the mean of its divisors is an integer number (7127040).

Almost surely, 2^28484609 is an apocalyptic number.

It is an amenable number.

28484609 is a deficient number, since it is larger than the sum of its proper divisors (23551).

28484609 is a wasteful number, since it uses less digits than its factorization.

28484609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23550.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28484609 is about 5337.0974321254. The cubic root of 28484609 is about 305.4007417082.

The spelling of 28484609 in words is "twenty-eight million, four hundred eighty-four thousand, six hundred nine".