73987 has 4 divisors (see below), whose sum is σ = 74536. Its totient is φ = 73440.

The previous prime is 73973. The next prime is 73999. The reversal of 73987 is 78937.

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, and also an emirpimes, since its reverse is a distinct semiprime: 78937 = 193 ⋅409.

It is a cyclic number.

It is not a de Polignac number, because 73987 - 2⁷ = 73859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 394.

It is an arithmetic number, because the mean of its divisors is an integer number (18634).

2⁷³⁹⁸⁷ is an apocalyptic number.

73987 is a deficient number, since it is larger than the sum of its proper divisors (549).

73987 is a wasteful number, since it uses less digits than its factorization.

73987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

The product of its digits is 10584, while the sum is 34.

The square root of 73987 is about 272.0055146500. The cubic root of 73987 is about 41.9809059088.

Subtracting 73987 from its reverse (78937), we obtain a triangular number (4950 = T₉₉).

The spelling of 73987 in words is "seventy-three thousand, nine hundred eighty-seven".