78671383 has 4 divisors (see below), whose sum is σ = 89910160. Its totient is φ = 67432608.

The previous prime is 78671377. The next prime is 78671387. The reversal of 78671383 is 38317687.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78671383 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 (78671387) 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, 5619378 + ... + 5619391.

It is an arithmetic number, because the mean of its divisors is an integer number (22477540).

Almost surely, 2^78671383 is an apocalyptic number.

78671383 is a deficient number, since it is larger than the sum of its proper divisors (11238777).

78671383 is a wasteful number, since it uses less digits than its factorization.

78671383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11238776.

The product of its digits is 169344, while the sum is 43.

The square root of 78671383 is about 8869.6890024397. The cubic root of 78671383 is about 428.4882609464.

It can be divided in two parts, 7 and 8671383, that multiplied together give a square (60699681 = 7791²).

The spelling of 78671383 in words is "seventy-eight million, six hundred seventy-one thousand, three hundred eighty-three".