79787 has 4 divisors (see below), whose sum is σ = 83280. Its totient is φ = 76296.

The previous prime is 79777. The next prime is 79801. The reversal of 79787 is 78797.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79787 - 2⁸ = 79531 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 79787.

It is not an unprimeable number, because it can be changed into a prime (79757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 1757.

It is an arithmetic number, because the mean of its divisors is an integer number (20820).

2⁷⁹⁷⁸⁷ is an apocalyptic number.

79787 is a deficient number, since it is larger than the sum of its proper divisors (3493).

79787 is a wasteful number, since it uses less digits than its factorization.

79787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492.

The product of its digits is 24696, while the sum is 38.

The square root of 79787 is about 282.4659271487. The cubic root of 79787 is about 43.0504185955.

Subtracting from 79787 its reverse (78797), we obtain a triangular number (990 = T₄₄).

The spelling of 79787 in words is "seventy-nine thousand, seven hundred eighty-seven".