28064809 has 8 divisors (see below), whose sum is σ = 28582848. Its totient is φ = 27550320.

The previous prime is 28064801. The next prime is 28064821. The reversal of 28064809 is 90846082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28064809 - 2³ = 28064801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28064801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18954 + ... + 20380.

It is an arithmetic number, because the mean of its divisors is an integer number (3572856).

Almost surely, 2^28064809 is an apocalyptic number.

It is an amenable number.

28064809 is a deficient number, since it is larger than the sum of its proper divisors (518039).

28064809 is a wasteful number, since it uses less digits than its factorization.

28064809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28064809 is about 5297.6229575159. The cubic root of 28064809 is about 303.8930003456.

The spelling of 28064809 in words is "twenty-eight million, sixty-four thousand, eight hundred nine".