87634717 has 4 divisors (see below), whose sum is σ = 87825276. Its totient is φ = 87444160.

The previous prime is 87634697. The next prime is 87634733. The reversal of 87634717 is 71743678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71743678 = 2 ⋅35871839.

It can be written as a sum of positive squares in 2 ways, for example, as 68459076 + 19175641 = 8274^2 + 4379^2 .

It is a cyclic number.

It is not a de Polignac number, because 87634717 - 2¹⁵ = 87601949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87634787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94588 + ... + 95509.

It is an arithmetic number, because the mean of its divisors is an integer number (21956319).

Almost surely, 2^87634717 is an apocalyptic number.

It is an amenable number.

87634717 is a deficient number, since it is larger than the sum of its proper divisors (190559).

87634717 is a wasteful number, since it uses less digits than its factorization.

87634717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190558.

The product of its digits is 197568, while the sum is 43.

The square root of 87634717 is about 9361.3416239340. The cubic root of 87634717 is about 444.1797235916.

The spelling of 87634717 in words is "eighty-seven million, six hundred thirty-four thousand, seven hundred seventeen".