78671767 has 4 divisors (see below), whose sum is σ = 83299536. Its totient is φ = 74044000.

The previous prime is 78671759. The next prime is 78671771. The reversal of 78671767 is 76717687.

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 78671767 - 2³ = 78671759 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 78671767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78671717) 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, 2313859 + ... + 2313892.

It is an arithmetic number, because the mean of its divisors is an integer number (20824884).

Almost surely, 2^78671767 is an apocalyptic number.

78671767 is a deficient number, since it is larger than the sum of its proper divisors (4627769).

78671767 is a wasteful number, since it uses less digits than its factorization.

78671767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4627768.

The product of its digits is 691488, while the sum is 49.

The square root of 78671767 is about 8869.7106491700. The cubic root of 78671767 is about 428.4889581047.

The spelling of 78671767 in words is "seventy-eight million, six hundred seventy-one thousand, seven hundred sixty-seven".