87666666 has 8 divisors (see below), whose sum is σ = 175333344. Its totient is φ = 29222220.

The previous prime is 87666647. The next prime is 87666679. The reversal of 87666666 is 66666678.

It is a happy number.

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

87666666 is an admirable number.

87666666 is a modest number, since divided by 66666 gives 876 as remainder.

It is a nialpdrome in base 10.

It is an unprimeable number.

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, 7305550 + ... + 7305561.

It is an arithmetic number, because the mean of its divisors is an integer number (21916668).

Almost surely, 2^87666666 is an apocalyptic number.

87666666 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.

87666666 is a wasteful number, since it uses less digits than its factorization.

87666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14611116.

The product of its digits is 2612736, while the sum is 51.

The square root of 87666666 is about 9363.0479011912. The cubic root of 87666666 is about 444.2336952528.

The spelling of 87666666 in words is "eighty-seven million, six hundred sixty-six thousand, six hundred sixty-six".