87309865 has 8 divisors (see below), whose sum is σ = 108384840. Its totient is φ = 67439232.

The previous prime is 87309821. The next prime is 87309889. The reversal of 87309865 is 56890378.

It can be written as a sum of positive squares in 4 ways, for example, as 3916441 + 83393424 = 1979^2 + 9132^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87309865 - 2²⁵ = 53755433 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 300924 + ... + 301213.

It is an arithmetic number, because the mean of its divisors is an integer number (13548105).

Almost surely, 2^87309865 is an apocalyptic number.

It is an amenable number.

87309865 is a deficient number, since it is larger than the sum of its proper divisors (21074975).

87309865 is a wasteful number, since it uses less digits than its factorization.

87309865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602171.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 87309865 is about 9343.9747966270. The cubic root of 87309865 is about 443.6302026680.

The spelling of 87309865 in words is "eighty-seven million, three hundred nine thousand, eight hundred sixty-five".