89987 has 6 divisors (see below), whose sum is σ = 94068. Its totient is φ = 86072.

The previous prime is 89983. The next prime is 89989. The reversal of 89987 is 78998.

It is not a de Polignac number, because 89987 - 2² = 89983 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 89987.

It is not an unprimeable number, because it can be changed into a prime (89983) 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, 788 + ... + 894.

It is an arithmetic number, because the mean of its divisors is an integer number (15678).

2⁸⁹⁹⁸⁷ is an apocalyptic number.

89987 is a deficient number, since it is larger than the sum of its proper divisors (4081).

89987 is a wasteful number, since it uses less digits than its factorization.

89987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 136 counting only the distinct ones).

The product of its digits is 36288, while the sum is 41.

The square root of 89987 is about 299.9783325509. The cubic root of 89987 is about 44.8118896483.

The spelling of 89987 in words is "eighty-nine thousand, nine hundred eighty-seven".