87686666 has 4 divisors (see below), whose sum is σ = 131530002. Its totient is φ = 43843332.

The previous prime is 87686639. The next prime is 87686689. The reversal of 87686666 is 66668678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66668678 = 2 ⋅33334339.

It can be written as a sum of positive squares in only one way, i.e., 85174441 + 2512225 = 9229^2 + 1585^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21921665 + ... + 21921668.

Almost surely, 2^87686666 is an apocalyptic number.

87686666 is a deficient number, since it is larger than the sum of its proper divisors (43843336).

87686666 is a wasteful number, since it uses less digits than its factorization.

87686666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43843335.

The product of its digits is 3483648, while the sum is 53.

The square root of 87686666 is about 9364.1158685698. The cubic root of 87686666 is about 444.2674747145.

The spelling of 87686666 in words is "eighty-seven million, six hundred eighty-six thousand, six hundred sixty-six".