78718711 has 4 divisors (see below), whose sum is σ = 78846912. Its totient is φ = 78590512.

The previous prime is 78718709. The next prime is 78718733. The reversal of 78718711 is 11781787.

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 78718711 - 2¹ = 78718709 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78718741) 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, 63175 + ... + 64408.

It is an arithmetic number, because the mean of its divisors is an integer number (19711728).

Almost surely, 2^78718711 is an apocalyptic number.

78718711 is a deficient number, since it is larger than the sum of its proper divisors (128201).

78718711 is a wasteful number, since it uses less digits than its factorization.

78718711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128200.

The product of its digits is 21952, while the sum is 40.

The square root of 78718711 is about 8872.3565640702. The cubic root of 78718711 is about 428.5741686227.

The spelling of 78718711 in words is "seventy-eight million, seven hundred eighteen thousand, seven hundred eleven".