78705317 has 4 divisors (see below), whose sum is σ = 79019136. Its totient is φ = 78391500.

The previous prime is 78705313. The next prime is 78705337. The reversal of 78705317 is 71350787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71350787 = 673 ⋅106019.

It is a cyclic number.

It is not a de Polignac number, because 78705317 - 2² = 78705313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78705313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156533 + ... + 157034.

It is an arithmetic number, because the mean of its divisors is an integer number (19754784).

Almost surely, 2^78705317 is an apocalyptic number.

It is an amenable number.

78705317 is a deficient number, since it is larger than the sum of its proper divisors (313819).

78705317 is a wasteful number, since it uses less digits than its factorization.

78705317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313818.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 78705317 is about 8871.6017155867. The cubic root of 78705317 is about 428.5498599251.

The spelling of 78705317 in words is "seventy-eight million, seven hundred five thousand, three hundred seventeen".