78820905039 has 4 divisors (see below), whose sum is σ = 105094540056. Its totient is φ = 52547270024.

The previous prime is 78820905019. The next prime is 78820905041. The reversal of 78820905039 is 93050902887.

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 78820905039 - 2⁸ = 78820904783 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78820904982 and 78820905000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78820905019) 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, 13136817504 + ... + 13136817509.

It is an arithmetic number, because the mean of its divisors is an integer number (26273635014).

Almost surely, 2^78820905039 is an apocalyptic number.

78820905039 is a deficient number, since it is larger than the sum of its proper divisors (26273635017).

78820905039 is a wasteful number, since it uses less digits than its factorization.

78820905039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26273635016.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 78820905039 in words is "seventy-eight billion, eight hundred twenty million, nine hundred five thousand, thirty-nine".