28044409 has 8 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 27201456.

The previous prime is 28044403. The next prime is 28044413. The reversal of 28044409 is 90444082.

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 28044409 - 2⁵ = 28044377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28044403) 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, 13182 + ... + 15160.

It is an arithmetic number, because the mean of its divisors is an integer number (3611520).

Almost surely, 2^28044409 is an apocalyptic number.

It is an amenable number.

28044409 is a deficient number, since it is larger than the sum of its proper divisors (847751).

28044409 is a wasteful number, since it uses less digits than its factorization.

28044409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28044409 is about 5295.6972156648. The cubic root of 28044409 is about 303.8193503413.

The spelling of 28044409 in words is "twenty-eight million, forty-four thousand, four hundred nine".