87818666 has 16 divisors (see below), whose sum is σ = 142652328. Its totient is φ = 40305600.

The previous prime is 87818657. The next prime is 87818677. The reversal of 87818666 is 66681878.

It can be written as a sum of positive squares in 4 ways, for example, as 13359025 + 74459641 = 3655^2 + 8629^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4625 + ... + 14036.

Almost surely, 2^87818666 is an apocalyptic number.

87818666 is a deficient number, since it is larger than the sum of its proper divisors (54833662).

87818666 is a wasteful number, since it uses less digits than its factorization.

87818666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18857.

The product of its digits is 774144, while the sum is 50.

The square root of 87818666 is about 9371.1614008083. The cubic root of 87818666 is about 444.4902904420.

The spelling of 87818666 in words is "eighty-seven million, eight hundred eighteen thousand, six hundred sixty-six".