87185865 has 16 divisors (see below), whose sum is σ = 150228288. Its totient is φ = 42922176.

The previous prime is 87185807. The next prime is 87185867. The reversal of 87185865 is 56858178.

It is not a de Polignac number, because 87185865 - 2⁹ = 87185353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87185867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223359 + ... + 223748.

It is an arithmetic number, because the mean of its divisors is an integer number (9389268).

Almost surely, 2^87185865 is an apocalyptic number.

It is an amenable number.

87185865 is a deficient number, since it is larger than the sum of its proper divisors (63042423).

87185865 is a wasteful number, since it uses less digits than its factorization.

87185865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447128.

The product of its digits is 537600, while the sum is 48.

The square root of 87185865 is about 9337.3371471742. The cubic root of 87185865 is about 443.4200843420.

It can be divided in two parts, 871 and 85865, that added together give a triangular number (86736 = T₄₁₆).

The spelling of 87185865 in words is "eighty-seven million, one hundred eighty-five thousand, eight hundred sixty-five".