78643579329 has 24 divisors (see below), whose sum is σ = 129952585152. Its totient is φ = 44894789280.

The previous prime is 78643579319. The next prime is 78643579349. The reversal of 78643579329 is 92397534687.

It is not a de Polignac number, because 78643579329 - 2⁵ = 78643579297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78643579319) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 552327 + ... + 679964.

It is an arithmetic number, because the mean of its divisors is an integer number (5414691048).

Almost surely, 2^78643579329 is an apocalyptic number.

It is an amenable number.

78643579329 is a deficient number, since it is larger than the sum of its proper divisors (51309005823).

78643579329 is a wasteful number, since it uses less digits than its factorization.

78643579329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233317 (or 1233314 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The spelling of 78643579329 in words is "seventy-eight billion, six hundred forty-three million, five hundred seventy-nine thousand, three hundred twenty-nine".