78671617 has 8 divisors (see below), whose sum is σ = 79743456. Its totient is φ = 77606592.

The previous prime is 78671591. The next prime is 78671623. The reversal of 78671617 is 71617687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78671617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78671717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24118 + ... + 27184.

It is an arithmetic number, because the mean of its divisors is an integer number (9967932).

Almost surely, 2^78671617 is an apocalyptic number.

It is an amenable number.

78671617 is a deficient number, since it is larger than the sum of its proper divisors (1071839).

78671617 is a wasteful number, since it uses less digits than its factorization.

78671617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its digits is 98784, while the sum is 43.

The square root of 78671617 is about 8869.7021934223. The cubic root of 78671617 is about 428.4886857775.

The spelling of 78671617 in words is "seventy-eight million, six hundred seventy-one thousand, six hundred seventeen".