87866917 has 4 divisors (see below), whose sum is σ = 88322380. Its totient is φ = 87411456.

The previous prime is 87866903. The next prime is 87866921. The reversal of 87866917 is 71966878.

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 45239076 + 42627841 = 6726^2 + 6529^2 .

It is a cyclic number.

It is not a de Polignac number, because 87866917 - 2⁷ = 87866789 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 (87866957) 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, 227442 + ... + 227827.

It is an arithmetic number, because the mean of its divisors is an integer number (22080595).

Almost surely, 2^87866917 is an apocalyptic number.

It is an amenable number.

87866917 is a deficient number, since it is larger than the sum of its proper divisors (455463).

87866917 is a wasteful number, since it uses less digits than its factorization.

87866917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455462.

The product of its digits is 1016064, while the sum is 52.

The square root of 87866917 is about 9373.7354880538. The cubic root of 87866917 is about 444.5716823040.

The spelling of 87866917 in words is "eighty-seven million, eight hundred sixty-six thousand, nine hundred seventeen".