78128136309 has 8 divisors (see below), whose sum is σ = 104177576160. Its totient is φ = 52082060336.

The previous prime is 78128136283. The next prime is 78128136313. The reversal of 78128136309 is 90363182187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78128136309 - 2⁹ = 78128135797 is a prime.

It is a super-2 number, since 2×78128136309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78128186309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786267 + ... + 880040.

It is an arithmetic number, because the mean of its divisors is an integer number (13022197020).

Almost surely, 2^78128136309 is an apocalyptic number.

It is an amenable number.

78128136309 is a deficient number, since it is larger than the sum of its proper divisors (26049439851).

78128136309 is a wasteful number, since it uses less digits than its factorization.

78128136309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681939.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 78128136309 in words is "seventy-eight billion, one hundred twenty-eight million, one hundred thirty-six thousand, three hundred nine".