87163681 has 6 divisors (see below), whose sum is σ = 95808146. Its totient is φ = 79239600.

The previous prime is 87163673. The next prime is 87163711. The reversal of 87163681 is 18636178.

It can be written as a sum of positive squares in only one way, i.e., 81360400 + 5803281 = 9020^2 + 2409^2 .

It is not a de Polignac number, because 87163681 - 2³ = 87163673 is a prime.

It is a super-2 number, since 2×87163681² = 15195014570939522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87163081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360060 + ... + 360301.

Almost surely, 2^87163681 is an apocalyptic number.

It is an amenable number.

87163681 is a deficient number, since it is larger than the sum of its proper divisors (8644465).

87163681 is a wasteful number, since it uses less digits than its factorization.

87163681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720383 (or 720372 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 87163681 is about 9336.1491526218. The cubic root of 87163681 is about 443.3824724899.

The spelling of 87163681 in words is "eighty-seven million, one hundred sixty-three thousand, six hundred eighty-one".