87186145 has 4 divisors (see below), whose sum is σ = 104623380. Its totient is φ = 69748912.

The previous prime is 87186137. The next prime is 87186161. The reversal of 87186145 is 54168178.

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 21316689 + 65869456 = 4617^2 + 8116^2 .

It is a cyclic number.

It is not a de Polignac number, because 87186145 - 2³ = 87186137 is a prime.

It is a super-2 number, since 2×87186145² = 15202847759922050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 87186098 and 87186107.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8718610 + ... + 8718619.

It is an arithmetic number, because the mean of its divisors is an integer number (26155845).

Almost surely, 2^87186145 is an apocalyptic number.

It is an amenable number.

87186145 is a deficient number, since it is larger than the sum of its proper divisors (17437235).

87186145 is a wasteful number, since it uses less digits than its factorization.

87186145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17437234.

The product of its digits is 53760, while the sum is 40.

The square root of 87186145 is about 9337.3521407303. The cubic root of 87186145 is about 443.4205590271.

The spelling of 87186145 in words is "eighty-seven million, one hundred eighty-six thousand, one hundred forty-five".