99987666 has 8 divisors (see below), whose sum is σ = 199975344. Its totient is φ = 33329220.

The previous prime is 99987619. The next prime is 99987683. The reversal of 99987666 is 66678999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

99987666 is an admirable number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8332300 + ... + 8332311.

It is an arithmetic number, because the mean of its divisors is an integer number (24996918).

Almost surely, 2^99987666 is an apocalyptic number.

99987666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99987666 is a wasteful number, since it uses less digits than its factorization.

99987666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16664616.

The product of its digits is 8817984, while the sum is 60.

The square root of 99987666 is about 9999.3832809829. The cubic root of 99987666 is about 464.1397994578.

The spelling of 99987666 in words is "ninety-nine million, nine hundred eighty-seven thousand, six hundred sixty-six".