87699209 has 16 divisors (see below), whose sum is σ = 101016720. Its totient is φ = 75417600.

The previous prime is 87699197. The next prime is 87699223. The reversal of 87699209 is 90299678.

It can be written as a sum of positive squares in 8 ways, for example, as 183184 + 87516025 = 428^2 + 9355^2 .

It is a cyclic number.

It is not a de Polignac number, because 87699209 - 2²⁴ = 70921993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87699229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20357 + ... + 24285.

It is an arithmetic number, because the mean of its divisors is an integer number (6313545).

Almost surely, 2^87699209 is an apocalyptic number.

It is an amenable number.

87699209 is a deficient number, since it is larger than the sum of its proper divisors (13317511).

87699209 is a wasteful number, since it uses less digits than its factorization.

87699209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 87699209 is about 9364.7855821690. The cubic root of 87699209 is about 444.2886568832.

The spelling of 87699209 in words is "eighty-seven million, six hundred ninety-nine thousand, two hundred nine".