87684665 has 16 divisors (see below), whose sum is σ = 106774416. Its totient is φ = 69120000.

The previous prime is 87684629. The next prime is 87684683. The reversal of 87684665 is 56648678.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9909904 + 77774761 = 3148^2 + 8819^2 .

It is not a de Polignac number, because 87684665 - 2⁸ = 87684409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202289 + ... + 202721.

It is an arithmetic number, because the mean of its divisors is an integer number (6673401).

Almost surely, 2^87684665 is an apocalyptic number.

It is an amenable number.

87684665 is a deficient number, since it is larger than the sum of its proper divisors (19089751).

87684665 is a wasteful number, since it uses less digits than its factorization.

87684665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940.

The product of its digits is 1935360, while the sum is 50.

The square root of 87684665 is about 9364.0090239171. The cubic root of 87684665 is about 444.2640953106.

The spelling of 87684665 in words is "eighty-seven million, six hundred eighty-four thousand, six hundred sixty-five".