78694138350208 has 64 divisors (see below), whose sum is σ = 163591726838400. Its totient is φ = 37635864634368.

The previous prime is 78694138350131. The next prime is 78694138350221. The reversal of 78694138350208 is 80205383149687.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 78694138350208.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 438369013 + ... + 438548491.

It is an arithmetic number, because the mean of its divisors is an integer number (2556120731850).

It is a 1-persistent number, because it is pandigital, but 2⋅78694138350208 = 157388276700416 is not.

Almost surely, 2^{78694138350208} is an apocalyptic number.

It is an amenable number.

78694138350208 is an abundant number, since it is smaller than the sum of its proper divisors (84897588488192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78694138350208 is a wasteful number, since it uses less digits than its factorization.

78694138350208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328449 (or 328437 counting only the distinct ones).

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 78694138350208 in words is "seventy-eight trillion, six hundred ninety-four billion, one hundred thirty-eight million, three hundred fifty thousand, two hundred eight".