87366665 has 4 divisors (see below), whose sum is σ = 104840004. Its totient is φ = 69893328.

The previous prime is 87366659. The next prime is 87366667. The reversal of 87366665 is 56666378.

It is a happy number.

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 31595641 + 55771024 = 5621^2 + 7468^2 .

It is a cyclic number.

It is not a de Polignac number, because 87366665 - 2²² = 83172361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87366667) by changing a digit.

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, 8736662 + ... + 8736671.

It is an arithmetic number, because the mean of its divisors is an integer number (26210001).

Almost surely, 2^87366665 is an apocalyptic number.

It is an amenable number.

87366665 is a deficient number, since it is larger than the sum of its proper divisors (17473339).

87366665 is a wasteful number, since it uses less digits than its factorization.

87366665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17473338.

The product of its digits is 1088640, while the sum is 47.

The square root of 87366665 is about 9347.0136942234. The cubic root of 87366665 is about 443.7263839842.

The spelling of 87366665 in words is "eighty-seven million, three hundred sixty-six thousand, six hundred sixty-five".