78766671 has 4 divisors (see below), whose sum is σ = 105022232. Its totient is φ = 52511112.

The previous prime is 78766663. The next prime is 78766687. The reversal of 78766671 is 17666787.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17666787 = 3 ⋅5888929.

It is not a de Polignac number, because 78766671 - 2³ = 78766663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78766671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78776671) 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, 13127776 + ... + 13127781.

It is an arithmetic number, because the mean of its divisors is an integer number (26255558).

Almost surely, 2^78766671 is an apocalyptic number.

78766671 is a deficient number, since it is larger than the sum of its proper divisors (26255561).

78766671 is a wasteful number, since it uses less digits than its factorization.

78766671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26255560.

The product of its digits is 592704, while the sum is 48.

The square root of 78766671 is about 8875.0589293818. The cubic root of 78766671 is about 428.6611883582.

It can be divided in two parts, 7 and 8766671, that added together give a palindrome (8766678).

The spelling of 78766671 in words is "seventy-eight million, seven hundred sixty-six thousand, six hundred seventy-one".