78667 has 4 divisors (see below), whose sum is σ = 79576. Its totient is φ = 77760.

The previous prime is 78653. The next prime is 78691. The reversal of 78667 is 76687.

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 78667 - 2⁷ = 78539 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (78607) 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, 309 + ... + 502.

It is an arithmetic number, because the mean of its divisors is an integer number (19894).

2⁷⁸⁶⁶⁷ is an apocalyptic number.

78667 is a deficient number, since it is larger than the sum of its proper divisors (909).

78667 is an equidigital number, since it uses as much as digits as its factorization.

78667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its digits is 14112, while the sum is 34.

The square root of 78667 is about 280.4763804672. The cubic root of 78667 is about 42.8480303377.

The spelling of 78667 in words is "seventy-eight thousand, six hundred sixty-seven".