87817736865 has 16 divisors (see below), whose sum is σ = 140796908928. Its totient is φ = 46739949696.

The previous prime is 87817736863. The next prime is 87817736873. The reversal of 87817736865 is 56863771878.

It is a happy number.

It is not a de Polignac number, because 87817736865 - 2¹ = 87817736863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87817736796 and 87817736805.

It is not an unprimeable number, because it can be changed into a prime (87817736863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6003492 + ... + 6018101.

It is an arithmetic number, because the mean of its divisors is an integer number (8799806808).

Almost surely, 2^87817736865 is an apocalyptic number.

It is an amenable number.

87817736865 is a deficient number, since it is larger than the sum of its proper divisors (52979172063).

87817736865 is a wasteful number, since it uses less digits than its factorization.

87817736865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12022088.

The product of its digits is 94832640, while the sum is 66.

The spelling of 87817736865 in words is "eighty-seven billion, eight hundred seventeen million, seven hundred thirty-six thousand, eight hundred sixty-five".