78317376578 has 16 divisors (see below), whose sum is σ = 135490090560. Its totient is φ = 33256657296.

The previous prime is 78317376523. The next prime is 78317376581. The reversal of 78317376578 is 87567371387.

It is a happy number.

It is a super-2 number, since 2×78317376578² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78317376578.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25659476 + ... + 25662527.

It is an arithmetic number, because the mean of its divisors is an integer number (8468130660).

Almost surely, 2^78317376578 is an apocalyptic number.

78317376578 is a deficient number, since it is larger than the sum of its proper divisors (57172713982).

78317376578 is a wasteful number, since it uses less digits than its factorization.

78317376578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51322121.

The product of its digits is 41489280, while the sum is 62.

The spelling of 78317376578 in words is "seventy-eight billion, three hundred seventeen million, three hundred seventy-six thousand, five hundred seventy-eight".