87166658 has 4 divisors (see below), whose sum is σ = 130749990. Its totient is φ = 43583328.

The previous prime is 87166657. The next prime is 87166679. The reversal of 87166658 is 85666178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78446449 + 8720209 = 8857^2 + 2953^2 .

It is not an unprimeable number, because it can be changed into a prime (87166657) by changing a digit.

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 as a sum of consecutive naturals, namely, 21791663 + ... + 21791666.

Almost surely, 2^87166658 is an apocalyptic number.

87166658 is a deficient number, since it is larger than the sum of its proper divisors (43583332).

87166658 is a wasteful number, since it uses less digits than its factorization.

87166658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43583331.

The product of its digits is 483840, while the sum is 47.

The square root of 87166658 is about 9336.3085853029. The cubic root of 87166658 is about 443.3875202138.

The spelling of 87166658 in words is "eighty-seven million, one hundred sixty-six thousand, six hundred fifty-eight".