90087 has 4 divisors (see below), whose sum is σ = 120120. Its totient is φ = 60056.

The previous prime is 90073. The next prime is 90089. The reversal of 90087 is 78009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78009 = 3 ⋅26003.

It is a cyclic number.

It is not a de Polignac number, because 90087 - 2⁴ = 90071 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15012 + ... + 15017.

It is an arithmetic number, because the mean of its divisors is an integer number (30030).

2⁹⁰⁰⁸⁷ is an apocalyptic number.

90087 is a deficient number, since it is larger than the sum of its proper divisors (30033).

90087 is a wasteful number, since it uses less digits than its factorization.

90087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30032.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 90087 is about 300.1449649753. The cubic root of 90087 is about 44.8284828971.

The spelling of 90087 in words is "ninety thousand, eighty-seven".