78939893987 has 4 divisors (see below), whose sum is σ = 78988414296. Its totient is φ = 78891373680.

The previous prime is 78939893971. The next prime is 78939894001.

It is a happy number.

78939893987 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 78939893987 - 2⁴ = 78939893971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78939893387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24257714 + ... + 24260967.

It is an arithmetic number, because the mean of its divisors is an integer number (19747103574).

Almost surely, 2^78939893987 is an apocalyptic number.

78939893987 is a deficient number, since it is larger than the sum of its proper divisors (48520309).

78939893987 is a wasteful number, since it uses less digits than its factorization.

78939893987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48520308.

The product of its digits is 1481421312, while the sum is 80.

The spelling of 78939893987 in words is "seventy-eight billion, nine hundred thirty-nine million, eight hundred ninety-three thousand, nine hundred eighty-seven".