87816869 has 12 divisors (see below), whose sum is σ = 102463884. Its totient is φ = 75043584.

The previous prime is 87816857. The next prime is 87816871. The reversal of 87816869 is 96861878.

It can be written as a sum of positive squares in 2 ways, for example, as 65820769 + 21996100 = 8113^2 + 4690^2 .

It is not a de Polignac number, because 87816869 - 2⁴ = 87816853 is a prime.

It is a super-2 number, since 2×87816869² = 15423604961926322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87816869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87816809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14759 + ... + 19835.

It is an arithmetic number, because the mean of its divisors is an integer number (8538657).

Almost surely, 2^87816869 is an apocalyptic number.

It is an amenable number.

87816869 is a deficient number, since it is larger than the sum of its proper divisors (14647015).

87816869 is a wasteful number, since it uses less digits than its factorization.

87816869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444 (or 5437 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 87816869 is about 9371.0655210600. The cubic root of 87816869 is about 444.4872586093.

The spelling of 87816869 in words is "eighty-seven million, eight hundred sixteen thousand, eight hundred sixty-nine".