80987 has 4 divisors (see below), whose sum is σ = 81840. Its totient is φ = 80136.

The previous prime is 80963. The next prime is 80989. The reversal of 80987 is 78908.

Added to its reverse (78908) it gives a triangular number (159895 = T₅₆₅).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 80987 - 2⁶ = 80923 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 80987.

It is not an unprimeable number, because it can be changed into a prime (80989) 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, 263 + ... + 480.

It is an arithmetic number, because the mean of its divisors is an integer number (20460).

2⁸⁰⁹⁸⁷ is an apocalyptic number.

80987 is a deficient number, since it is larger than the sum of its proper divisors (853).

80987 is a wasteful number, since it uses less digits than its factorization.

80987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 80987 is about 284.5821498267. The cubic root of 80987 is about 43.2651722638.

Adding to 80987 its reverse (78908), we get a triangular number (159895 = T₅₆₅).

The spelling of 80987 in words is "eighty thousand, nine hundred eighty-seven".