87889475209 has 4 divisors (see below), whose sum is σ = 89330286340. Its totient is φ = 86448664080.

The previous prime is 87889475203. The next prime is 87889475239. The reversal of 87889475209 is 90257498878.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22326336400 + 65563138809 = 149420^2 + 256053^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87889475209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87889475203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720405474 + ... + 720405595.

It is an arithmetic number, because the mean of its divisors is an integer number (22332571585).

Almost surely, 2^87889475209 is an apocalyptic number.

It is an amenable number.

87889475209 is a deficient number, since it is larger than the sum of its proper divisors (1440811131).

87889475209 is a wasteful number, since it uses less digits than its factorization.

87889475209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440811130.

The product of its (nonzero) digits is 81285120, while the sum is 67.

The spelling of 87889475209 in words is "eighty-seven billion, eight hundred eighty-nine million, four hundred seventy-five thousand, two hundred nine".