78831283939 has 4 divisors (see below), whose sum is σ = 80664569656. Its totient is φ = 76997998224.

The previous prime is 78831283903. The next prime is 78831283987. The reversal of 78831283939 is 93938213887.

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-78831283939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78831283439) 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, 916642794 + ... + 916642879.

It is an arithmetic number, because the mean of its divisors is an integer number (20166142414).

Almost surely, 2^78831283939 is an apocalyptic number.

78831283939 is a deficient number, since it is larger than the sum of its proper divisors (1833285717).

78831283939 is a wasteful number, since it uses less digits than its factorization.

78831283939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833285716.

The product of its digits is 15676416, while the sum is 61.

The spelling of 78831283939 in words is "seventy-eight billion, eight hundred thirty-one million, two hundred eighty-three thousand, nine hundred thirty-nine".