8987681 has 4 divisors (see below), whose sum is σ = 9067332. Its totient is φ = 8908032.

The previous prime is 8987659. The next prime is 8987689. The reversal of 8987681 is 1867898.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1867898 = 2 ⋅933949.

It can be written as a sum of positive squares in 2 ways, for example, as 4326400 + 4661281 = 2080^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 8987681 - 2¹⁰ = 8986657 is a prime.

It is a super-2 number, since 2×8987681² = 161556819515522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8987689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39656 + ... + 39881.

It is an arithmetic number, because the mean of its divisors is an integer number (2266833).

Almost surely, 2^8987681 is an apocalyptic number.

It is an amenable number.

8987681 is a deficient number, since it is larger than the sum of its proper divisors (79651).

8987681 is a wasteful number, since it uses less digits than its factorization.

8987681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79650.

The product of its digits is 193536, while the sum is 47.

The square root of 8987681 is about 2997.9461302699. The cubic root of 8987681 is about 207.9134332202.

The spelling of 8987681 in words is "eight million, nine hundred eighty-seven thousand, six hundred eighty-one".