78739968672 has 48 divisors (see below), whose sum is σ = 229658244480. Its totient is φ = 26246655936.

The previous prime is 78739968649. The next prime is 78739968683. The reversal of 78739968672 is 27686993787.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 78739968672.

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, 45566248 + ... + 45567975.

It is an arithmetic number, because the mean of its divisors is an integer number (4784546760).

Almost surely, 2^78739968672 is an apocalyptic number.

78739968672 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78739968672 is an abundant number, since it is smaller than the sum of its proper divisors (150918275808).

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

78739968672 is a wasteful number, since it uses less digits than its factorization.

78739968672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91134242 (or 91134228 counting only the distinct ones).

The product of its digits is 384072192, while the sum is 72.

The spelling of 78739968672 in words is "seventy-eight billion, seven hundred thirty-nine million, nine hundred sixty-eight thousand, six hundred seventy-two".