87885617 has 4 divisors (see below), whose sum is σ = 88445556. Its totient is φ = 87325680.

The previous prime is 87885601. The next prime is 87885647. The reversal of 87885617 is 71658878.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71658878 = 2 ⋅35829439.

It can be written as a sum of positive squares in 2 ways, for example, as 51897616 + 35988001 = 7204^2 + 5999^2 .

It is a cyclic number.

It is not a de Polignac number, because 87885617 - 2⁴ = 87885601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87885647) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 279734 + ... + 280047.

It is an arithmetic number, because the mean of its divisors is an integer number (22111389).

Almost surely, 2^87885617 is an apocalyptic number.

It is an amenable number.

87885617 is a deficient number, since it is larger than the sum of its proper divisors (559939).

87885617 is a wasteful number, since it uses less digits than its factorization.

87885617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559938.

The product of its digits is 752640, while the sum is 50.

The square root of 87885617 is about 9374.7329028618. The cubic root of 87885617 is about 444.6032182565.

The spelling of 87885617 in words is "eighty-seven million, eight hundred eighty-five thousand, six hundred seventeen".