78996328709 has 4 divisors (see below), whose sum is σ = 83154030240. Its totient is φ = 74838627180.

The previous prime is 78996328703. The next prime is 78996328717. The reversal of 78996328709 is 90782369987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78996328709 - 2⁴ = 78996328693 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 (78996328703) 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, 2078850737 + ... + 2078850774.

It is an arithmetic number, because the mean of its divisors is an integer number (20788507560).

Almost surely, 2^78996328709 is an apocalyptic number.

It is an amenable number.

78996328709 is a deficient number, since it is larger than the sum of its proper divisors (4157701531).

78996328709 is a wasteful number, since it uses less digits than its factorization.

78996328709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4157701530.

The product of its (nonzero) digits is 82301184, while the sum is 68.

The spelling of 78996328709 in words is "seventy-eight billion, nine hundred ninety-six million, three hundred twenty-eight thousand, seven hundred nine".