87105609 has 6 divisors (see below), whose sum is σ = 125819226. Its totient is φ = 58070400.

The previous prime is 87105593. The next prime is 87105611. The reversal of 87105609 is 90650178.

87105609 is a `hidden beast` number, since 87 + 10 + 560 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81054009 + 6051600 = 9003^2 + 2460^2 .

It is not a de Polignac number, because 87105609 - 2⁴ = 87105593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87105619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4839192 + ... + 4839209.

It is an arithmetic number, because the mean of its divisors is an integer number (20969871).

Almost surely, 2^87105609 is an apocalyptic number.

It is an amenable number.

87105609 is a deficient number, since it is larger than the sum of its proper divisors (38713617).

87105609 is a wasteful number, since it uses less digits than its factorization.

87105609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9678407 (or 9678404 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 87105609 is about 9333.0385727265. The cubic root of 87105609 is about 443.2839841176.

The spelling of 87105609 in words is "eighty-seven million, one hundred five thousand, six hundred nine".