28496809 has 8 divisors (see below), whose sum is σ = 31141152. Its totient is φ = 25861440.

The previous prime is 28496779. The next prime is 28496813. The reversal of 28496809 is 90869482.

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

It is not a de Polignac number, because 28496809 - 2⁹ = 28496297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28496849) 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, 5617 + ... + 9409.

It is an arithmetic number, because the mean of its divisors is an integer number (3892644).

Almost surely, 2^28496809 is an apocalyptic number.

It is an amenable number.

28496809 is a deficient number, since it is larger than the sum of its proper divisors (2644343).

28496809 is a wasteful number, since it uses less digits than its factorization.

28496809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 28496809 is about 5338.2402531171. The cubic root of 28496809 is about 305.4443366807. Note that the first 3 decimals are identical.

The spelling of 28496809 in words is "twenty-eight million, four hundred ninety-six thousand, eight hundred nine".