78766 has 4 divisors (see below), whose sum is σ = 118152. Its totient is φ = 39382.

The previous prime is 78737. The next prime is 78779. The reversal of 78766 is 66787.

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

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19690 + ... + 19693.

It is an arithmetic number, because the mean of its divisors is an integer number (29538).

2⁷⁸⁷⁶⁶ is an apocalyptic number.

78766 is the 178-th centered pentagonal number.

78766 is a deficient number, since it is larger than the sum of its proper divisors (39386).

78766 is a wasteful number, since it uses less digits than its factorization.

78766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39385.

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

The square root of 78766 is about 280.6528104260. The cubic root of 78766 is about 42.8659971124.

The spelling of 78766 in words is "seventy-eight thousand, seven hundred sixty-six".