78396434807039 has 8 divisors (see below), whose sum is σ = 78583754323200. Its totient is φ = 78209258123736.

The previous prime is 78396434807029. The next prime is 78396434807051. The reversal of 78396434807039 is 93070843469387.

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 78396434807039 - 2⁴ = 78396434807023 is a prime.

It is a super-2 number, since 2×78396434807039² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78396434807029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34609127 + ... + 36804680.

It is an arithmetic number, because the mean of its divisors is an integer number (9822969290400).

Almost surely, 2^{78396434807039} is an apocalyptic number.

78396434807039 is a deficient number, since it is larger than the sum of its proper divisors (187319516161).

78396434807039 is a wasteful number, since it uses less digits than its factorization.

78396434807039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71416429.

The product of its (nonzero) digits is 658409472, while the sum is 71.

The spelling of 78396434807039 in words is "seventy-eight trillion, three hundred ninety-six billion, four hundred thirty-four million, eight hundred seven thousand, thirty-nine".