78671 has 4 divisors (see below), whose sum is σ = 79344. Its totient is φ = 78000.

The previous prime is 78653. The next prime is 78691. The reversal of 78671 is 17687.

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: 17687 = 23 ⋅769.

It is a cyclic number.

It is not a de Polignac number, because 78671 - 2⁶ = 78607 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78671.

It is not an unprimeable number, because it can be changed into a prime (78691) 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, 110 + ... + 411.

It is an arithmetic number, because the mean of its divisors is an integer number (19836).

2⁷⁸⁶⁷¹ is an apocalyptic number.

78671 is a deficient number, since it is larger than the sum of its proper divisors (673).

78671 is a wasteful number, since it uses less digits than its factorization.

78671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672.

The product of its digits is 2352, while the sum is 29.

The square root of 78671 is about 280.4835111018. The cubic root of 78671 is about 42.8487565601.

The spelling of 78671 in words is "seventy-eight thousand, six hundred seventy-one".