28884251809 has 8 divisors (see below), whose sum is σ = 33011664768. Its totient is φ = 24757111680.

The previous prime is 28884251779. The next prime is 28884251813. The reversal of 28884251809 is 90815248882.

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

It is not a de Polignac number, because 28884251809 - 2¹⁵ = 28884219041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28884251809.

It is not an unprimeable number, because it can be changed into a prime (28884251849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271404 + ... + 362530.

It is an arithmetic number, because the mean of its divisors is an integer number (4126458096).

Almost surely, 2^28884251809 is an apocalyptic number.

It is an amenable number.

28884251809 is a deficient number, since it is larger than the sum of its proper divisors (4127412959).

28884251809 is an equidigital number, since it uses as much as digits as its factorization.

28884251809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136415.

The product of its (nonzero) digits is 2949120, while the sum is 55.

The spelling of 28884251809 in words is "twenty-eight billion, eight hundred eighty-four million, two hundred fifty-one thousand, eight hundred nine".