87329881 has 4 divisors (see below), whose sum is σ = 87834852. Its totient is φ = 86824912.

The previous prime is 87329863. The next prime is 87329887. The reversal of 87329881 is 18892378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18892378 = 2 ⋅9446189.

It can be written as a sum of positive squares in 2 ways, for example, as 83265625 + 4064256 = 9125^2 + 2016^2 .

It is a cyclic number.

It is not a de Polignac number, because 87329881 - 2²¹ = 85232729 is a prime.

It is a super-2 number, since 2×87329881² = 15253016230948322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87329887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252226 + ... + 252571.

It is an arithmetic number, because the mean of its divisors is an integer number (21958713).

Almost surely, 2^87329881 is an apocalyptic number.

It is an amenable number.

87329881 is a deficient number, since it is larger than the sum of its proper divisors (504971).

87329881 is a wasteful number, since it uses less digits than its factorization.

87329881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504970.

The product of its digits is 193536, while the sum is 46.

The square root of 87329881 is about 9345.0457997808. The cubic root of 87329881 is about 443.6641011805.

The spelling of 87329881 in words is "eighty-seven million, three hundred twenty-nine thousand, eight hundred eighty-one".