87689881 has 8 divisors (see below), whose sum is σ = 90868680. Its totient is φ = 84521472.

The previous prime is 87689837. The next prime is 87689887. The reversal of 87689881 is 18898678.

It can be written as a sum of positive squares in 4 ways, for example, as 34633225 + 53056656 = 5885^2 + 7284^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87689881 - 2⁹ = 87689369 is a prime.

It is a super-2 number, since 2×87689881² = 15379030459588322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87689887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17271 + ... + 21763.

It is an arithmetic number, because the mean of its divisors is an integer number (11358585).

Almost surely, 2^87689881 is an apocalyptic number.

It is an amenable number.

87689881 is a deficient number, since it is larger than the sum of its proper divisors (3178799).

87689881 is a wasteful number, since it uses less digits than its factorization.

87689881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195.

The product of its digits is 1548288, while the sum is 55.

The square root of 87689881 is about 9364.2875329627. The cubic root of 87689881 is about 444.2729042838.

The spelling of 87689881 in words is "eighty-seven million, six hundred eighty-nine thousand, eight hundred eighty-one".