87188005 has 4 divisors (see below), whose sum is σ = 104625612. Its totient is φ = 69750400.

The previous prime is 87187999. The next prime is 87188039. The reversal of 87188005 is 50088178.

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

It can be written as a sum of positive squares in 2 ways, for example, as 46253601 + 40934404 = 6801^2 + 6398^2 .

It is not a de Polignac number, because 87188005 - 2⁵ = 87187973 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8718796 + ... + 8718805.

It is an arithmetic number, because the mean of its divisors is an integer number (26156403).

Almost surely, 2^87188005 is an apocalyptic number.

It is an amenable number.

87188005 is a deficient number, since it is larger than the sum of its proper divisors (17437607).

87188005 is a wasteful number, since it uses less digits than its factorization.

87188005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17437606.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 87188005 is about 9337.4517401698. The cubic root of 87188005 is about 443.4237122665.

The spelling of 87188005 in words is "eighty-seven million, one hundred eighty-eight thousand, five".