78873317 has 4 divisors (see below), whose sum is σ = 78914220. Its totient is φ = 78832416.

The previous prime is 78873281. The next prime is 78873329. The reversal of 78873317 is 71337887.

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 78304801 + 568516 = 8849^2 + 754^2 .

It is a cyclic number.

It is not a de Polignac number, because 78873317 - 2¹⁰ = 78872293 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 (78873337) 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, 17408 + ... + 21465.

It is an arithmetic number, because the mean of its divisors is an integer number (19728555).

Almost surely, 2^78873317 is an apocalyptic number.

It is an amenable number.

78873317 is a deficient number, since it is larger than the sum of its proper divisors (40903).

78873317 is a wasteful number, since it uses less digits than its factorization.

78873317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40902.

The product of its digits is 197568, while the sum is 44.

The square root of 78873317 is about 8881.0650825225. The cubic root of 78873317 is about 428.8545628066.

The spelling of 78873317 in words is "seventy-eight million, eight hundred seventy-three thousand, three hundred seventeen".