87666613 has 4 divisors (see below), whose sum is σ = 87952480. Its totient is φ = 87380748.

The previous prime is 87666587. The next prime is 87666617. The reversal of 87666613 is 31666678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87666613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87666613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87666617) by changing a digit.

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, 142473 + ... + 143086.

It is an arithmetic number, because the mean of its divisors is an integer number (21988120).

Almost surely, 2^87666613 is an apocalyptic number.

It is an amenable number.

87666613 is a deficient number, since it is larger than the sum of its proper divisors (285867).

87666613 is a wasteful number, since it uses less digits than its factorization.

87666613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285866.

The product of its digits is 217728, while the sum is 43.

The square root of 87666613 is about 9363.0450709158. The cubic root of 87666613 is about 444.2336057304.

The spelling of 87666613 in words is "eighty-seven million, six hundred sixty-six thousand, six hundred thirteen".