87688662209 has 4 divisors (see below), whose sum is σ = 87691418580. Its totient is φ = 87685905840.

The previous prime is 87688662181. The next prime is 87688662211. The reversal of 87688662209 is 90226688678.

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 66159556225 + 21529105984 = 257215^2 + 146728^2 .

It is a cyclic number.

It is not a de Polignac number, because 87688662209 - 2³² = 83393694913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87688661209) 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 3 ways as a sum of consecutive naturals, for example, 1329902 + ... + 1394279.

It is an arithmetic number, because the mean of its divisors is an integer number (21922854645).

Almost surely, 2^87688662209 is an apocalyptic number.

It is an amenable number.

87688662209 is a deficient number, since it is larger than the sum of its proper divisors (2756371).

87688662209 is a wasteful number, since it uses less digits than its factorization.

87688662209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756370.

The product of its (nonzero) digits is 27869184, while the sum is 62.

The spelling of 87688662209 in words is "eighty-seven billion, six hundred eighty-eight million, six hundred sixty-two thousand, two hundred nine".