78545317 has 4 divisors (see below), whose sum is σ = 78700140. Its totient is φ = 78390496.

The previous prime is 78545281. The next prime is 78545333. The reversal of 78545317 is 71354587.

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 33802596 + 44742721 = 5814^2 + 6689^2 .

It is a cyclic number.

It is not a de Polignac number, because 78545317 - 2⁷ = 78545189 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 78545317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78545347) 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, 76648 + ... + 77665.

It is an arithmetic number, because the mean of its divisors is an integer number (19675035).

Almost surely, 2^78545317 is an apocalyptic number.

It is an amenable number.

78545317 is a deficient number, since it is larger than the sum of its proper divisors (154823).

78545317 is a wasteful number, since it uses less digits than its factorization.

78545317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154822.

The product of its digits is 117600, while the sum is 40.

The square root of 78545317 is about 8862.5795906158. The cubic root of 78545317 is about 428.2592633187.

The spelling of 78545317 in words is "seventy-eight million, five hundred forty-five thousand, three hundred seventeen".