87817085 has 8 divisors (see below), whose sum is σ = 105483480. Its totient is φ = 70185024.

The previous prime is 87817073. The next prime is 87817091. The reversal of 87817085 is 58071878.

It can be written as a sum of positive squares in 4 ways, for example, as 22174681 + 65642404 = 4709^2 + 8102^2 .

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 87817085 - 2¹⁰ = 87816061 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2570 + ... + 13499.

It is an arithmetic number, because the mean of its divisors is an integer number (13185435).

Almost surely, 2^87817085 is an apocalyptic number.

It is an amenable number.

87817085 is a deficient number, since it is larger than the sum of its proper divisors (17666395).

87817085 is a wasteful number, since it uses less digits than its factorization.

87817085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17167.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 87817085 is about 9371.0770458897. The cubic root of 87817085 is about 444.4876230388.

The spelling of 87817085 in words is "eighty-seven million, eight hundred seventeen thousand, eighty-five".