28808814409 has 8 divisors (see below), whose sum is σ = 28964307240. Its totient is φ = 28653619200.

The previous prime is 28808814401. The next prime is 28808814421. The reversal of 28808814409 is 90441880882.

It can be written as a sum of positive squares in 4 ways, for example, as 13290631225 + 15518183184 = 115285^2 + 124572^2 .

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 28808814409 - 2³ = 28808814401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28808814401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121089 + ... + 268849.

It is an arithmetic number, because the mean of its divisors is an integer number (3620538405).

Almost surely, 2^28808814409 is an apocalyptic number.

It is an amenable number.

28808814409 is a deficient number, since it is larger than the sum of its proper divisors (155492831).

28808814409 is a wasteful number, since it uses less digits than its factorization.

28808814409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148811.

The product of its (nonzero) digits is 1179648, while the sum is 52.

The spelling of 28808814409 in words is "twenty-eight billion, eight hundred eight million, eight hundred fourteen thousand, four hundred nine".