78555713 has 4 divisors (see below), whose sum is σ = 80471748. Its totient is φ = 76639680.

The previous prime is 78555703. The next prime is 78555769. The reversal of 78555713 is 31755587.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19465744 + 59089969 = 4412^2 + 7687^2 .

It is a cyclic number.

It is not a de Polignac number, because 78555713 - 2²⁶ = 11446849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1915993 = 78555713 / (7 + 8 + 5 + 5 + 5 + 7 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78555703) 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, 957956 + ... + 958037.

It is an arithmetic number, because the mean of its divisors is an integer number (20117937).

Almost surely, 2^78555713 is an apocalyptic number.

It is an amenable number.

78555713 is a deficient number, since it is larger than the sum of its proper divisors (1916035).

78555713 is a wasteful number, since it uses less digits than its factorization.

78555713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916034.

The product of its digits is 147000, while the sum is 41.

The square root of 78555713 is about 8863.1660821627. The cubic root of 78555713 is about 428.2781568147.

The spelling of 78555713 in words is "seventy-eight million, five hundred fifty-five thousand, seven hundred thirteen".