78673 has 4 divisors (see below), whose sum is σ = 89920. Its totient is φ = 67428.

The previous prime is 78653. The next prime is 78691. The reversal of 78673 is 37687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78673 - 2¹³ = 70481 is a prime.

It is an Ulam number.

It is a Duffinian number.

78673 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (78623) 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, 5613 + ... + 5626.

It is an arithmetic number, because the mean of its divisors is an integer number (22480).

2⁷⁸⁶⁷³ is an apocalyptic number.

It is an amenable number.

78673 is a deficient number, since it is larger than the sum of its proper divisors (11247).

78673 is a wasteful number, since it uses less digits than its factorization.

78673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11246.

The product of its digits is 7056, while the sum is 31.

The square root of 78673 is about 280.4870763511. The cubic root of 78673 is about 42.8491196621.

Subtracting from 78673 its product of digits (7056), we obtain a palindrome (71617).

The spelling of 78673 in words is "seventy-eight thousand, six hundred seventy-three".